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.

1974 ◽  
Vol 39 (1) ◽  
pp. 185-186
Author(s):  
Ann Yasuhara
1968 ◽  
Vol 15 (4) ◽  
pp. 680-692 ◽  
Author(s):  
Dennis F. Cudia ◽  
Wilson E. Singletary

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