TY  - JOUR
AU  - V. L. Selivanov
TI  - Hierarchies of hyperarithmetic sets and functions
JO  - Algebra i logika
PY  - 1983
SP  - 666
EP  - 692
VL  - 22
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_1983_22_6_a5/
LA  - ru
ID  - AL_1983_22_6_a5
ER  -