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@article{AL_1979_18_4_a6, author = {V. L. Selivanov}, title = {The structure of degrees of unsolvability of index sets}, journal = {Algebra i logika}, pages = {463--480}, publisher = {mathdoc}, volume = {18}, number = {4}, year = {1979}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1979_18_4_a6/} }
V. L. Selivanov. The structure of degrees of unsolvability of index sets. Algebra i logika, Tome 18 (1979) no. 4, pp. 463-480. http://geodesic.mathdoc.fr/item/AL_1979_18_4_a6/