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@article{TRSPY_1958_52_a5, author = {G. S. Tseitin}, title = {An associative calculus with an insoluble problem of equivalence}, journal = {Informatics and Automation}, pages = {172--189}, publisher = {mathdoc}, volume = {52}, year = {1958}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1958_52_a5/} }
G. S. Tseitin. An associative calculus with an insoluble problem of equivalence. Informatics and Automation, Problems of the constructive direction in mathematics. Part 1, Tome 52 (1958), pp. 172-189. http://geodesic.mathdoc.fr/item/TRSPY_1958_52_a5/