TY  - JOUR
AU  - A. Yanushauskas
TI  - A reduction of a directional derivative problem
JO  - Doklady Akademii Nauk
PY  - 1972
SP  - 1014
EP  - 1017
VL  - 203
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1972_203_5_a10/
LA  - ru
ID  - DAN_1972_203_5_a10
ER  -