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@article{DAN_1969_185_6_a7, author = {Yu. T. Medvedev}, title = {A certain method of proof of unsolvability of algorithmic problems}, journal = {Doklady Akademii Nauk}, pages = {1232--1235}, publisher = {mathdoc}, volume = {185}, number = {6}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1969_185_6_a7/} }
Yu. T. Medvedev. A certain method of proof of unsolvability of algorithmic problems. Doklady Akademii Nauk, Tome 185 (1969) no. 6, pp. 1232-1235. http://geodesic.mathdoc.fr/item/DAN_1969_185_6_a7/