Joseph S. Ullian
Seymour Ginsburg and Joseph Ullian.
Ambiguity in context free languages.
Journal of the ACM
, 13(1):62-89, January 1966.
References and Citations.
Seymour Ginsburg and Joseph Ullian.
Preservation of unambiguity and inherent ambiguity in context-free languages.
Journal of the ACM
, 13(3):364-368, July 1966.
References and Citations.
Thomas N. Hibbard and Joseph Ullian.
The independence of inherent ambiguity from complementedness among context-free languages.
Journal of the ACM
, 13(4):588-593, October 1966.
References and Citations.
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