The structure of degrees of unsolvability of index sets
Algebra i logika, Tome 18 (1979) no. 4, pp. 463-480.

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     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/}
}
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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/