Dennis F. Cudia and Wilson E. Singletary. The Post correspondence problem. The journal of symbolic logic, vol. 33 (1968), pp. 418–430. - Dennis F. Cudia and Wilson E. Singletary. Degrees of unsolvability in formal grammars. Journal of the Association for Computing Machinery, vol. 15 (1968), pp. 680–692.
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1971 ◽
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