%0 Journal Article %A M. A. Krasnosel'skii %A N. A. Bobylev %A È. M. Muhamadiev %T On a scheme for studying degenerate extremals of functionals in the classical calculus of variations %J Doklady Akademii Nauk %D 1978 %P 530-533 %V 240 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1978_240_3_a7/ %G ru %F DAN_1978_240_3_a7