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Author: van den Broek, P.M.
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2012

van den Broek, P.M. (2012) Intersection of Feature Models. In: 16th International Software Product Line Conference, SPLC 2012, 2-7 Sep 2012, Salvador, Brazil. pp. 61-65. ACM. ISBN 978-1-4503-1095-6

2011

van den Broek, P.M. and Noppen, J.A.R. (2011) Exact Membership Functions for the Fuzzy Weighted Average. In: Computational Intelligence. Studies in Computational Intelligence 343. Springer, Berlin / Heidelberg, pp. 85-99. ISBN 978-3-642-20206-3
Galvao Lourenco da Silva, I. and Akşit, M. and van den Broek, P.M. and Hendriks, M.F.H. (2011) Using design rationale to improve SPL traceability. In: Aspect-oriented, Model-driven Software Product Lines. Cambridge University Press, Cambridge, UK, pp. 263-283. ISBN 978-0-521-76722-4
Noppen, J.A.R. and van den Broek, P.M. (2011) Imperfect information in software product line engineering. In: Aspect-Oriented, Model-driven Software Product Lines: the AMPLE way. Cambridge University Press, Cambridge, pp. 378-410. ISBN 978-0-521-76722-4
Ribeiro, R.A. and Moreira, A.M. and van den Broek, P.M. and Pimentel, A. (2011) Hybrid Assessment Method for Software Engineering Decisions. Decision Support Systems, 51 (1). pp. 208-219. ISSN 0167-9236 *** ISI Impact 2,604 ***

2010

van den Broek, P.M. (2010) Optimization of Product Instantiation using Integer Programming. In: Proceedings of the 14th International Software Product Line Conference, Volume 2, 14 Sep 2010, Jeju Island, South Korea. pp. 107-111. Lancaster University, Lancaster, UK. ISBN 978-1-86220-274-0
van den Broek, P.M. and Galvao Lourenco da Silva, I. and Noppen, J.A.R. (2010) Merging Feature Models. In: 14th International Software Product Line Conference, Volume 2, 14 Sep 2010, Jeju Island, South Korea. pp. 83-89. Lancaster University, Lancaster, UK. ISBN 978-1-86220-274-0
Ciraci, S. and van den Broek, P.M. and Akşit, M. (2010) Graph-Based Verification of Static Program Constraints. In: Proceedings of the 25th Annual ACM Symposium on Applied Computing 2010, 22-26 March, 2010, Sierre, Switzerland. pp. 2265-2273. ACM. ISBN 978-1-60558-638-0
Ciraci, S. and van den Broek, P.M. and Akşit, M. (2010) Verifying Runtime Reconfiguration Requirements on UML Models. In: Views on Evolvability of Embedded Systems. Springer, pp. 209-225. ISBN 978-90-481-9848-1
Ciraci, S. and Havinga, W.K. and Akşit, M. and Bockisch, C.M. and van den Broek, P.M. (2010) A graph-based aspect interference detection approach for UML-based aspect-oriented models. Transactions on Aspect-Oriented Software Development, 6210. pp. 321-374. ISSN 0302-9743 ISBN 978-3-642-16085-1
Galvao Lourenco da Silva, I. and van den Broek, P.M. and Akşit, M. (2010) A model for variability design rationale in SPL. In: Proceedings of the Fourth European Conference on Software Architecture: Companion Volume, 23 Aug 2010, Copenhagen, Denmark. pp. 332-335. ACM International Conference Proceeding Series Companion Volume. ACM. ISBN 978-1-4503-0179-4

2009

van den Broek, P.M. and Galvao Lourenco da Silva, I. (2009) Analysis of Feature Models using Generalised Feature Trees. In: Third International Workshop on Variability Modelling of Software-intensive Systems, 28-30 Jan 2009, Sevilla, Spain. pp. 29-35. ICB-Research Report (29). Universität Duisburg-Essen. ISSN 1860-2770
van den Broek, P.M. and Noppen, J.A.R. (2009) Fuzzy Weighted Average: Analytical Solution. In: Proceedings of the International Joint Conference on Computational Intelligence 2009, 5-7 Oct 2009, Madeira. pp. 31-38. INSTICC. ISBN 978-989-674-014-6
Ciraci, S. and Havinga, W.K. and Akşit, M. and Bockisch, C.M. and van den Broek, P.M. (2009) A graph-based aspect interference detection approach for UML-based aspect-oriented models. Technical Report TR-CTIT-09-39, Centre for Telematics and Information Technology University of Twente, Enschede. ISSN 1381-3625
Figueiredo, E. and Galvao Lourenco da Silva, I. and Shakil Khan, S. and Garcia, A. and Sant'Anna, C. and Pimentel, A. and Medeiros, A.L. and Fernandes da Silva, L. and Vasconcelos Batista, T. and Almeida Ribeiro, R. and van den Broek, P.M. and Akşit, M. and Zschaler, S. and Moreira, A.M. (2009) Detecting architecture instabilities with concern traces: An exploratory study. In: Joint Working IEEE/IFIP Conference on Software Architecture 2009 and European Conference on Software Architecture 2009, WICSA/ECSA 2009, 14-17 Sep 2009, Cambridge, UK. pp. 261-264. IEEE Computer Society. ISBN 978-1-4244-4985-9
Noppen, J.A.R. and van den Broek, P.M. and Weston, N. and Rashid, A. (2009) Modelling Imperfect Product Line Requirements with Fuzzy Feature Diagrams. In: Third International Workshop on Variability Modelling of Software-intensive Systems, 28-30 Jan 2009, Sevilla, Spain. pp. 93-102. ICB-Research Report (29). Universität Duisburg Essen. ISSN 1860-2770

2008

van den Broek, P.M. and Galvao Lourenco da Silva, I. and Noppen, J.A.R. (2008) Elimination of Constraints from Feature Trees. In: Proceedings of the 12th International Software Product Line Conference, 12 Sept 2008, Limerick, Ireland. pp. 227-232. Lero International Science Centre, University of Limerick, Ireland. ISBN 978-1-905952-06-9
Ciraci, S. and van den Broek, P.M. and Akşit, M. (2008) Framework for Computer-Aided Evolution of Object-Oriented Designs. In: The 2nd IEEE International Workshop on Quality Oriented Reuse of Software (QUORS 2008), 01-08-2009, Turku, Finland. pp. 757-764. 32nd Annual IEEE International Computer Software and Applications Conference 2. IEEE Computer Society. ISBN 978-0-7695-3262-2
Noppen, J.A.R. and van den Broek, P.M. and Akşit, M. (2008) Software development with imperfect information. Soft Computing - A Fusion of Foundations, Methodologies and Applications, 12 (1). pp. 3-28. ISSN 1432-7643 *** ISI Impact 1,630 ***

2007

van den Broek, P.M. and Noppen, J.A.R. (2007) The Compositional Rule of Inference and Zadeh’s Extension Principle for Non-normal Fuzzy Sets. In: Theoretical Advances and Applications of Fuzzy Logic and Soft Computing. Advances in Soft Computing 42. Springer, Berlin Heidelberg, Germany, pp. 621-628. ISSN 1615-3871 ISBN 978-3-540-72433-9
Ciraci, S. and van den Broek, P.M. and Akşit, M. (2007) A Taxonomy for a Constructive Approach to Software Evolution. Journal of Software, 2 (2). pp. 84-97. ISSN 1796-217X
Ciraci, S. and van den Broek, P.M. and Akşit, M. (2007) A Constructive Approach To Software Evolution. In: Workshop on Model-Driven Software Evolution - MoDSE2007, 20 March 2007, Amsterdam, the Netherlands. pp. 1-9. Vrije Universiteit Amsterdam. ISBN not assigned
Noppen, J.A.R. and van den Broek, P.M. and Akşit, M. (2007) Imperfect Requirements in Software Development. In: Requirements Engineering: Foundation for Software Quality, 11-12 Jun 2007, Trondheim, Norway. pp. 247-261. Lecture Notes in computer Science (4542). Springer Verlag. ISBN 978-3-540-73030-9

2006

van den Broek, P.M. and Noppen, J.A.R. (2006) Fuzzy Weighted Average: Alternative Approach. In: NAFIPS06 2006 Conference of the North American Fuzzy Information Processing Society, 3-6 Jun 2006, Montreal, Canada. pp. 126-130. IEEE Computer Society. ISBN 0-7803-9188-8
van den Broek, P.M. and Noppen, J.A.R. (2006) Rankings from Fuzzy Pairwise Comparisons. In: CIMCA05, the 2005 International Conference on Computational Intelligence for Modelling, Control & Automation, 28-30 Nov 2005, Vienna, Austria. pp. 188-190. IEEE Computer Society. ISBN 978-0-7695-2504-4
Ciraci, S. and van den Broek, P.M. (2006) Modeling Software Evolution using Algebraic Graph Rewriting. In: Workshop on Architecture-Centric Evolution (ACE 2006), 3-7 July 2006, Nantes, France. RUG. ISBN not assigned
Ciraci, S. and van den Broek, P.M. (2006) Evolvability as a Quality Attribute of Software Architectures. In: The International ERCIM Workshop on Software Evolution 2006, 6-7 Apr 2006, LIFL et l'INRIA, Universite des Sciences et Technologies de Lille, France. pp. 29-31. UMH. ISBN not assigned

2005

Noppen, J.A.R. and van den Broek, P.M. and Akşit, M. (2005) A Model for Quality Optimization in Software Design Processes. In: Net.Objectdays'05, 20-22 September 2005, Erfurt, Germany. pp. 529-541. tranSIT. ISBN 3980862844
Noppen, J.A.R. and van den Broek, P.M. and Akşit, M. (2005) Dealing with Imprecise Quality Factors in Software Design. In: International Conference on Software Engineering: Workshop on Software Quality, 17 May 2005, St. Louis, Missouri, USA. pp. 40-45. ACM Press. ISSN 0163-5948 ISBN 1595931228

2004

van den Broek, P.M. and Noppen, J.A.R. (2004) Approximate Reasoning with Fuzzy Booleans. In: Information Processing and Management of Uncertainty in Knowledge-Based Systems (IPMU 2004), 4-9 July 2004, Perugia, Italy. pp. 1429-1434. Editrice Universita La Sapienza, Italy. ISBN 8887242542
van den Broek, P.M. and Noppen, J.A.R. (2004) Comparison of two approaches to dynamic programming. ACM SIGACT News, 34 (4). pp. 111-116. ISSN 0163-5700
Noppen, J.A.R. and van den Broek, P.M. and Akşit, M. (2004) Dealing with Fuzzy Information in Software Design Methods. In: IEEE Annual Meeting of theFuzzy Information Processing Society (NAFIPS), June 2004, Alberta, Canada. pp. 22-27. IEEE Computer Society. ISBN 0780383761

2003

van den Broek, P.M. (2003) Comparison of Two Approaches to Approximated Reasoning. In: EUSFLAT 2003, 10-12 September 2003, Zittau/Goerlitz, Germany. pp. 512-516. European Society for Fuzzy Logic and Technology. ISBN 3-9808089-4-7

2002

Tekinerdogan, B. and Saeki, M. and Sunyé, G. and van den Broek, P.M. and Hruby, P. (2002) Automating Object-Oriented Software Development Methods. In: ECOOP 2001 Workshops. Lecture Notes in Computer Science 2323. Springer Verlag, Berlin Heidelberg, pp. 41-56. ISSN 0302-9743 ISBN 9783540436751

2001

van den Broek, P.M. (2001) An Efficient Algorithm for Approximate Reasoning with Multiple Antecedents. In: 2001 International Conference on Computational Mopdelling, Control & Automation - CIMCA 2001, 9-11 July 2001, Las Vegas, USA. pp. 332-338. University of Canberra, Australia. ISBN 0858898470
Tekinerdogan, B. and van den Broek, P.M. and Saeki, M. and Hruby, P. and Sunyé, G. (2001) Automating Object-Oriented Software Development; Methods Workshop. Technical Report TR-CTIT-01-35, Centre for Telematics and Information Technology University of Twente, Enschede. ISSN 1381-3625

1999

van den Berg, K.G. and Akşit, M. and van den Broek, P.M. (1999) Use Cases in Object-Oriented Software Development. Technical Report AMIDST/WP2/N003/V02, Centre for Telematics and Information Technology University of Twente, Enschede. ISSN 1381-3625
van den Berg, K.G. and Akşit, M. and van den Broek, P.M. (1999) Modeling the Object-Oriented Software Process: OPEN and the Unified Process. Technical Report AMIDST/WP2/N002/V02, Centre for Telematics and Information Technology University of Twente, Enschede. ISSN 1381-3625
van den Broek, P.M. (1999) Efficient Algorithms for Approximate Reasoning. In: 6th International Conference on Neural Information Processing (ICONIP), 16-20 November 1999, Perth, Western Australia. pp. 292-297. IEEE Computer Society. ISBN 0780358716
van den Broek, P.M. (1999) Multiconditional Approximate Reasoning with Continuous Piecewise Linear Membership Functions. In: Computational Intelligence for Modelling, Control & Automation - CIMCA'99, 17-19 February 1999, Vienna, Austria. pp. 246-253. IOS Press. ISSN 1383-7575 ISBN 9789051994742
Wieringa, R.J. and Astesiano, E. and Reggio, G. and Le Guennec, A. and Hussman, H. and van den Berg, K.G. and van den Broek, P.M. (1999) UML Semantics FAQ: Dynamic Behaviour and Concurrency. In: ECOOP'99 Workshop Reader, 14-18 June 1999, Lisbon, Portugal. pp. 49-52. Lecture Notes in Computer Science 1743. Springer-Verlag. ISBN 3-540-66954-X

1997

Akşit, M. and Marcelloni, F. and Tekinerdogan, B. and van den Berg, K.G. and van den Broek, P.M. (1997) Active Software Artifacts. In: ECOOP'97 Workshop Reader, June 1997, Jyväskylä, Finland. pp. 307-310. Lecture Notes in Computer Science 1357. Springer. ISSN 0302-9743 ISBN 3540640398
van den Broek, P.M. (1997) Fuzzy Reasoning with Continuous Piecewise Linear Membership Functions. In: Annual Meeting of the North American Fuzzy Information Processing Society (NAFIPS), 21-24 September 1997, Syracuse, NY, USA. pp. 371-376. North American Fuzzy Information Processing Society. ISBN 0780340787

1996

van den Berg, K.G. and van den Broek, P.M. (1996) Programmers' Performance on Structured versus Nonstructured Function Definitions. Information and Software Technology, 38 (7). pp. 477-492. ISSN 0950-5849 *** ISI Impact 1,569 ***
van den Broek, P.M. and van den Berg, K.G. (1996) Musical Equational Programs: A Functional Approach. ACM SIGPLAN Notices, 31 (11). pp. 56-65. ISSN 0362-1340 *** ISI Impact 0,488 ***

1995

van den Berg, K.G. and van den Broek, P.M. (1995) Static Analysis of Functional Programs. Information and Software Technology, 37 (4). pp. 213-224. ISSN 0950-5849 *** ISI Impact 1,569 ***
van den Berg, K.G. and van den Broek, P.M. (1995) Validation in the Software Metric Development Process. Memorandum Memoranda Informatica INF-95-10, Department of Computer Science, University of Twente, Enschede. ISSN 0924-3755
van den Berg, K.G. and van den Broek, P.M. (1995) Programmers Performance on Structured versus Nonstructured Function Definitions. Memorandum Memoranda Informatica INF-95-11, Department of Computer Science, University of Twente, Enschede. ISSN 0924-3755
van den Berg, K.G. and van den Broek, P.M. (1995) Axiomatic Validation in the Software Metric Development Process. In: Software Measurement. International Thomson Computer Press, London, UK, pp. 157-177. ISBN 18503271787
van den Broek, P.M. and van den Berg, K.G. (1995) A Generalised Approach to Software Structure Metrics. IEE Software Engineering Journal, 10 (2). pp. 61-67. ISSN 0268-6961
van Gilst, F.A. and van den Broek, P.M. (1995) A new programming technique for lazy functional languages. Science of Computer Programming, 24 (1). pp. 63-81. ISSN 0167-6423 *** ISI Impact 0,828 ***

1994

van den Berg, K.G. and van den Broek, P.M. (1994) Axiomatic Testing of Structure Metrics. In: Second International Software Metrics Symposium, 24-26 October 1994, London, UK. pp. 45-53. IEEE Computer Society. ISBN 0818658657
van den Berg, K.G. and van den Broek, P.M. (1994) Static Analysis of Functional Programs. Memorandum Memoranda Informatica INF-94-53, Department of Computer Science, University of Twente, Enschede. ISSN 0924-3755
van den Berg, K.G. and van den Broek, P.M. (1994) Axiomatic Testing of Structure Metrics. Memorandum Memoranda Informatica INF-94-06, Department of Computer Science, University of Twente, Enschede. ISSN 0924-3755
van den Broek, P.M. and van den Berg, K.G. (1994) A Generalised Approach to Software Structure Metrics. Memorandum Memoranda Informatica INF-94-22, Department of Computer Science, University of Twente, Enschede. ISSN 0924-3755

1993

van den Berg, K.G. and van den Broek, P.M. and van Petersen, G.M. (1993) Validation of Structure Metrics: A Case Study. In: First International Software Metrics Symposium, 21-22 May 1993, Baltimore, MD, USA. pp. 92-99. IEEE Computer Society. ISBN 0818637404
van den Broek, P.M. and van den Berg, K.G. (1993) Modelling Software for Structure Metrics. Memorandum Memoranda Informatica INF-93-13, Department of Computer Science, University of Twente, Enschede. ISSN 0924-3755

1992

van den Berg, K.G. and van den Broek, P.M. and van Petersen, G.M. (1992) Validation of Structure Metrics: A Case Study. Memorandum Memoranda Informatica INF-92-58, Department of Computer Science, University of Twente, Enschede. ISSN 0924-3755
van den Broek, P.M. and Kuper, J. (1992) Graph rewriting using a single pushout: a comparison. In: Computing Science in the Netherlands, 4-5 Nov 1992, Utrecht, the Netherlands. pp. 85-95. Stichting Mathematisch Centrum. ISBN 906196413x

1991

van den Broek, P.M. (1991) Algebraic graph rewriting using a single pushout. In: TAPSOFT'91: Proceedings of the International Joint Conference on Theory and Practice of Software Development. Lecture Notes in Computer Science 493. Springer-Verlag, New York, NY, USA, pp. 90-102. ISBN 3540539824

1988

van den Broek, P.M. (1988) Comparison of two graph-rewrite systems. Theoretical Computer Science, 61 (1). pp. 67-81. ISSN 0304-3975 *** ISI Impact 0,643 ***
van den Broek, P.M. (1988) Confluence of indirection reductions in graph rewrite systems. Information Processing Letters, 29 (3). pp. 143-148. ISSN 0020-0190 *** ISI Impact 0,605 ***

1984

van den Broek, P.M. (1984) Twistor geometry. Helvetica Physica Acta, 57. pp. 429-458. ISSN 0018-0238
van den Broek, P.M. (1984) Symmetry transformations in indefinite metric spaces; a generalization of Wigner's theorem. Physica A, 127 (3). pp. 599-612. ISSN 0378-4371 *** ISI Impact 1,785 ***
van den Broek, P.M. (1984) Group representations in indefinite metric spaces. Journal of Mathematical Physics, 25 (5). pp. 1205-1210. ISSN 0022-2488 *** ISI Impact 1,234 ***
van den Broek, P.M. (1984) Group representations in indefinite metric spaces. In: Group Theoretical Methods in Physics. Lecture Notes in Physics 201. Springer Verlag, Berlin, pp. 99-100. ISSN 1616-6361 ISBN 3-540-13335-6

1983

van den Broek, P.M. (1983) Twistor space, Minkowski space and the conformal group. Physica A, 122 (3). pp. 587-592. ISSN 0378-4371 *** ISI Impact 1,785 ***
van den Broek, P.M. (1983) Inversions in twistor space. In: Group Theoretical Methods in Physics: Proceedings of the XIth International Colloquium. Lecture Notes in Physics 180. Springer-Verlag, Berlin, pp. 495-496. ISSN 1616-6361 ISBN 978-3-540-12291-3

1981

van den Broek, P.M. (1981) Lower bounds for the ground state energy of spin systems. Physics letters A, 81 (2,3). pp. 185-186. ISSN 0375-9601 *** ISI Impact 1,677 ***

1980

van den Broek, P.M. (1980) On the ground state energy of the linear antiferromagnetic Heisenberg chain with nearest and next-nearest neighbour interactions. Journal of Physics C: Solid State Physics, 13 (29). pp. 5423-5427. ISSN 0022-3719
van den Broek, P.M. (1980) Exact value of the ground state energy of the linear antiferromagnetic Heisenberg chain with nearest and next-nearest neighbour interactions. Physics Letters A, 77 (4). pp. 261-262. ISSN 0375-9601 *** ISI Impact 1,677 ***
van den Broek, P.M. (1980) Method for the determination of Clebsch-Gordan coefficients of finite magnetic groups. In: Group Theoretical Methods in Physics. Annals of the Israel Physical Society 3. Adam Hilger Ltd., Bristol, UK, pp. 386-388. ISBN 0-85274-424-2
van den Broek, P.M. and Caspers, W.J. and Willemse, M.W.M. (1980) Ground state energies of antiferromagnetic lattices. Physica A, 104 (1-2). pp. 298-308. ISSN 0378-4371 *** ISI Impact 1,785 ***
van den Broek, P.M. and Dirl, R. (1980) Equivalence of induced representations. Journal of Mathematical Physics, 21 (10). pp. 2487-2490. ISSN 0022-2488 *** ISI Impact 1,234 ***

1979

van den Broek, P.M. (1979) The PUA representations of the Shubnikov point groups. Journal of Physics C: Solid State Physics, 12 (7). pp. 1201-1219. ISSN 0022-3719
van den Broek, P.M. (1979) On the type and the standardform of induced UA representations. Letters in Mathematical Physics, 3 (2). pp. 151-159. ISSN 0377-9017 *** ISI Impact 1,517 ***
van den Broek, P.M. (1979) Clebsch-Gordan coefficients of finite magnetic groups. Journal of Mathematical Physics, 20 (10). pp. 2028-2035. ISSN 0022-2488 *** ISI Impact 1,234 ***
van den Broek, P.M. (1979) Projective unitary-antiunitary representations of the Shubnikov space groups. PhD thesis, University of Nijmegen, Nijmegen, the Netherlands. ISBN not assigned
van den Broek, P.M. (1979) The Clebsch-Gordan coefficients of the crystallographic space groups. Physica Status Solidi B, 94 (2). pp. 487-496. ISSN 0370-1972 *** ISI Impact 1,522 ***
van den Broek, P.M. (1979) Comment on Takagi's method for the construction of unitary representations of space groups. Physical review B: Condensed matter and materials physics, 20 (10). pp. 4368-4371. ISSN 1098-0121

1978

van den Broek, P.M. (1978) Induced PUA representations and selection rules. Journal of Physics A: Mathematical and General, 11 (5). pp. 813-820. ISSN 1751-8113 *** ISI Impact 1,933 ***
van den Broek, P.M. (1978) Selection rules for Shubnikov space groups. Journal of Physics A: Mathematical and General, 11 (12). pp. 2353-2361. ISSN 1751-8113 *** ISI Impact 1,933 ***
van den Broek, P.M. (1978) PUA representations of Shubnikov space groups and selection rules. In: Group Theoretical Methods in Physics. Lecture Notes in Physics 79. Springer-Verlag, Berlin Heidelberg, pp. 402-404. ISSN 1616-6361 ISBN 3-540-08848-2
van den Broek, P.M. and Cornwell, J.F. (1978) Clebsch-Gordan coefficients of symmetry groups. Physica Status Solidi B, 90 (1). pp. 211-224. ISSN 0370-1972 *** ISI Impact 1,522 ***

1977

van den Broek, P.M. (1977) On the factor systems of the Shubnikov space groups. Journal of Physics A: Mathematical and General, 10 (5). pp. 649-658. ISSN 1751-8113 *** ISI Impact 1,933 ***
van den Broek, P.M. (1977) On the finite-dimensional PUA representations of the Shubnikov space groups. Journal of Physics A: Mathematical and General, 10 (10). pp. 1653-1663. ISSN 1751-8113 *** ISI Impact 1,933 ***

1976

van den Broek, P.M. (1976) On the determination of factor systems of PUA representations. Reports on Mathematical Physics, 9 (3). pp. 321-330. ISSN 0034-4877 *** ISI Impact 0,870 ***
van den Broek, P.M. (1976) The relation between the factor systems of a group and those of an invariant subgroup. Journal of Physics A: Mathematical and General, 9 (6). pp. 855-862. ISSN 1751-8113 *** ISI Impact 1,933 ***
van den Broek, P.M. (1976) On the determination of factor systems of PUA representations. In: Group Theoretical Methods in Physics, 1976, Nijmegen, the Netherlands. pp. 435-440. Lecture Notes in Physics 50. Springer-Verlag. ISSN 1616-6361 ISBN 3-540-07789-8