TY - JOUR AU - V. A. Kovalev AU - Yu. N. Radayev TI - On a~form of the first variation of the action integral over a~varied domain JO - Izvestiya of Saratov University. Mathematics. Mechanics. Informatics PY - 2014 SP - 199 EP - 209 VL - 14 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/ISU_2014_14_2_a8/ LA - ru ID - ISU_2014_14_2_a8 ER -