P. S. Novikov. Ob algoritmičéskoj nérazréšimosti problémy toždéstva (On algorithmic unsolvability of the word problem). Doklady Akadémii Nauk SSSR, vol. 85 (1952), pp. 709–712.

1954 ◽  
Vol 19 (1) ◽  
pp. 58-60
Author(s):  
William W. Boone
1968 ◽  
Vol 33 (2) ◽  
pp. 296-297
Author(s):  
J. C. Shepherdson

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