Communications of the ACM
A syntax controlled generator of formal language processors
Communications of the ACM
The algebra of derivations and a semithue parser
ACM '69 Proceedings of the 1969 24th national conference
Formal languages and their relation to automata
Formal languages and their relation to automata
The derivation language of a phrase structure grammar
Journal of Computer and System Sciences
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Conditions for a phrase-structure grammar (Chomsky 0-type grammar) are established which warrant that any of its derivations univocally defines a syntactical structure of the sentence. The simplifications for the particular cases of context-sensitive and context-free grammars are indicated.