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@article{DAN_1973_211_5_a6, author = {M. I. Kanovitch}, title = {On the complexity of approximation of arithmetic sets}, journal = {Doklady Akademii Nauk}, pages = {1038--1041}, publisher = {mathdoc}, volume = {211}, number = {5}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1973_211_5_a6/} }
M. I. Kanovitch. On the complexity of approximation of arithmetic sets. Doklady Akademii Nauk, Tome 211 (1973) no. 5, pp. 1038-1041. http://geodesic.mathdoc.fr/item/DAN_1973_211_5_a6/