@article{DAN_1969_189_6_a8,
     author = {A. M. Evseev},
     title = {Ground energy level of helium, as calculated using integrals over trajectories},
     journal = {Doklady Akademii Nauk},
     pages = {1197--1199},
     publisher = {mathdoc},
     volume = {189},
     number = {6},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_189_6_a8/}
}