@article{TMF_1980_45_2_a9,
     author = {B. V. Moshchinskii and C. Rodriguez and V. K. Fedyanin},
     title = {Generating functional and the functional analog {of~Bogolyubov's} variational method},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {251--260},
     publisher = {mathdoc},
     volume = {45},
     number = {2},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1980_45_2_a9/}
}