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Darstellung von Orthonitroamidoparamethoxylbenzol und Orthonitroamidoparaäthoxylbenzol durch Einwirkung von Ammoniak auf Mononitrodimethylhydrochinon oder Mononitrodiäfhylhydrochinon
PS Novikov. Ob algoritmičéskoj nérazréšimosti problémy toždéstva slov v téorii grupp (Algorithmic unsolvability of the word problem in group theory). Trudy Matématičéskogo Instituta iméni VA Stéklova, vol. 44. Izdatél'stvo Akadémii Nauk SSSR, Moscow1955, 143 pp.