On the Syntactic Structures of Unrestricted Grammars I. Generative Grammars and Phrase Structure Grammars - H. William Buttelmann (Inf. Control., 1975)

On the Syntactic Structures of Unrestricted Grammars II. Automata - H. William Buttelmann (Inf. Control., 1975)

NLG - Natural Language Graphics. - David C. Brown; Stanley C. Kwasny; H. William Buttelmann; B. Chandrasekaran 001; Norman K. Sondheimer (IJCAI, 1977)

Natural language graphics. - David C. Brown; H. William Buttelmann; B. Chandrasekaran 001; Stanley C. Kwasny; Norman K. Sondheimer (SIGART Newsl., 1977)

Semantic-Syntax-Directed Translation - Arthur B. Pyster; H. William Buttelmann (Inf. Control., 1978)

Formal Methodology of Translation. I. Semantic Preserving Translations - Ramachandran Krishnaswamy; H. William Buttelmann (Inf. Control., 1978)

Formal Methodology of Translation. II. Capabilities and Limitations - Ramachandran Krishnaswamy; H. William Buttelmann (Inf. Control., 1978)