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@article{IVM_1981_11_a10, author = {N. R. Bukharaev}, title = {{\it {{\CYRR}-{\cyrg}-}simple} sets, {\it {{\CYRF}{\CYRM}}} sets and their degrees of unsolvability}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {69--71}, publisher = {mathdoc}, number = {11}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1981_11_a10/} }
N. R. Bukharaev. {\it Р-г-}simple sets, {\it ФМ} sets and their degrees of unsolvability. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 11 (1981), pp. 69-71. http://geodesic.mathdoc.fr/item/IVM_1981_11_a10/