%0 Journal Article %A B. V. Moshchinskii %A C. Rodriguez %A V. K. Fedyanin %T Generating functional and the functional analog of~Bogolyubov's variational method %J Teoretičeskaâ i matematičeskaâ fizika %D 1980 %P 251-260 %V 45 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_1980_45_2_a9/ %G ru %F TMF_1980_45_2_a9