@article{DAN_1958_119_2_a12,
     author = {N. N. Bogolyubov},
     title = {A variation principle in the problem of many bodies},
     journal = {Doklady Akademii Nauk},
     pages = {244--246},
     publisher = {mathdoc},
     volume = {119},
     number = {2},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_119_2_a12/}
}