TY  - JOUR
AU  - V. L. Selivanov
TI  - The structure of degrees of unsolvability of index sets
JO  - Algebra i logika
PY  - 1979
SP  - 463
EP  - 480
VL  - 18
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_1979_18_4_a6/
LA  - ru
ID  - AL_1979_18_4_a6
ER  -