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@article{DAN_1967_173_6_a8, author = {Yu. V. Matiyasevich}, title = {Simple examples of unsolvable associative calculi}, journal = {Doklady Akademii Nauk}, pages = {1264--1266}, publisher = {mathdoc}, volume = {173}, number = {6}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1967_173_6_a8/} }
Yu. V. Matiyasevich. Simple examples of unsolvable associative calculi. Doklady Akademii Nauk, Tome 173 (1967) no. 6, pp. 1264-1266. http://geodesic.mathdoc.fr/item/DAN_1967_173_6_a8/