%0 Journal Article %A F. V. Guseinov %T Lower semicontinuous extension of the fundamental problem of calculus of variations %J Matematičeskie zametki %D 1989 %P 43-52 %V 45 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_1989_45_3_a4/ %G ru %F MZM_1989_45_3_a4