A New Normal-Form Theorem for Context-Free Phrase Structure Grammars
Journal of the ACM (JACM)
Matrix Equations and Normal Forms for Context-Free Grammars
Journal of the ACM (JACM)
Communications of the ACM
Report on the algorithmic language ALGOL 60
Communications of the ACM
STOC '73 Proceedings of the fifth annual ACM symposium on Theory of computing
Roots of the hardest context free language and other constructs
ACM SIGACT News
Formal languages and their relation to automata
Formal languages and their relation to automata
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