TY  - JOUR
AU  - S. K. Norkin
TI  - The problem of discrimination for the normal domain $N_4$ in the space $R^3$
JO  - Differencialʹnye uravneniâ
PY  - 1976
SP  - 263
EP  - 271
VL  - 12
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1976_12_2_a8/
LA  - ru
ID  - DE_1976_12_2_a8
ER  -