TY  - JOUR
AU  - Ya. L. Kreinin
TI  - About a property of sets effectively different from all $\Phi$-sets
JO  - Doklady Akademii Nauk
PY  - 1958
SP  - 237
EP  - 238
VL  - 118
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1958_118_2_a7/
LA  - ru
ID  - DAN_1958_118_2_a7
ER  -