P. S. Novikov. Ob algoritmičéskoj nérazréšimosti problémy toždéstva slov v téorii grupp (Algorithmic unsolvability of the word problem in group theory). Trudy Matématičéskogo Instituta iméni V. A. Stéklova, vol. 44. Izdatél'stvo Akadémii Nauk SSSR, Moscow1955, 143 pp.
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