%0 Journal Article %A M. I. Zelikin %T An analogue of Pontryagin's maximum principle in problems of minimization of multiple integrals %J Izvestiya. Mathematics %D 2017 %P 973-984 %V 81 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_2017_81_5_a2/ %G en %F IM2_2017_81_5_a2