TY  - JOUR
AU  - S. K. Norkin
TI  - Uniqueness of the $O$-curve along a direction that is analogous to the exceptional one
JO  - Differencialʹnye uravneniâ
PY  - 1975
SP  - 758
EP  - 759
VL  - 11
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1975_11_4_a21/
LA  - ru
ID  - DE_1975_11_4_a21
ER  -