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Nijholt, A. (1977) Cover results and normal forms. In: Mathematical Foundations of Computer Science 1977, 5-9 Sep 1977, Tatranská Lomnica, Czechoslovakia. pp. 420-429. Lecture Notes in Computer Science 53. Springer Verlag. ISSN 0302-9743 ISBN 3-540-08353-7
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Official URL: http://dx.doi.org/10.1007/3-540-08353-7_163
The purpose of this paper was to sketch an area of problems for the concept of cover. We showed that in spite of some remarks in the literature the problem of covering (unambiguous and -free) cfg's with cfg's in GNF is open. Moreover we gave some properties of covers and we showed a relation between covers and parsability.
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