TY  - JOUR
AU  - V. A. Vershinin
TI  - On certain operations over constructive sets with equality
JO  - Doklady Akademii Nauk
PY  - 1977
SP  - 269
EP  - 272
VL  - 234
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1977_234_2_a1/
LA  - ru
ID  - DAN_1977_234_2_a1
ER  -