TY  - JOUR
AU  - R. Downey
AU  - A. G. Melnikov
TI  - On realization of index sets in $\Pi_1^0$-classes
JO  - Algebra i logika
PY  - 2019
SP  - 659
EP  - 663
VL  - 58
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_2019_58_5_a5/
LA  - ru
ID  - AL_2019_58_5_a5
ER  -