ON THE SYNTACTIC STRUCTURES OF UNRESTRICTED GRAMMARS. I. GENERATIVE GRAMMARS AND PHRASE STRUCTURE GRAMMARS.BUTTELMANN HW.1975; INFORM. AND CONTROL; U.S.A.; DA. 1975; VOL. 29; NO 1; PP. 29-80; BIBL. 12 REF.Article

ON THE SYNTACTIC STRUCTURES OF UNRESTRICTED GRAMMARS. II. AUTOMATA.BUTTELMANN HW.1975; INFORM. AND CONTROL; U.S.A.; DA. 1975; VOL. 29; NO 1; PP. 81-101; BIBL. 13 REF.Article

A NOTE ON PETRI NET LANGUAGES.MANDRIOLI D.1977; INFORM. AND CONTROL; U.S.A.; DA. 1977; VOL. 34; NO 2; PP. 169-171; BIBL. 6 REF.Article

GENERAL PROPERTIES OF DERIVATIONAL COMPLEXITY.IGARASHI Y.1977; ACTA INFORMAT.; ALLEM.; DA. 1977; VOL. 8; NO 3; PP. 267-283; BIBL. 15 REF.Article