%0 Journal Article %A I. A. Kvasnikov %T The application of the variation principle to the superconduction theory %J Doklady Akademii Nauk %D 1958 %P 675-677 %V 119 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1958_119_4_a12/ %G ru %F DAN_1958_119_4_a12