TY  - JOUR
AU  - V. I. Kazimirov
AU  - V. I. Plotnikov
AU  - I. M. Starobinets
TI  - An~abstract scheme for the method of variations and necessary conditions for an extremum
JO  - Izvestiya. Mathematics 
PY  - 1986
SP  - 133
EP  - 151
VL  - 26
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM2_1986_26_1_a4/
LA  - en
ID  - IM2_1986_26_1_a4
ER  -