TY  - JOUR
AU  - G. S. Rozenberg
TI  - On the question of necessary and sufficient conditions for a minimum in variational problems
JO  - Differencialʹnye uravneniâ
PY  - 1968
SP  - 290
EP  - 297
VL  - 4
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1968_4_2_a11/
LA  - ru
ID  - DE_1968_4_2_a11
ER  -