@article{DAN_1970_194_2_a4,
     author = {A. L. Kalashnikov and S. N. Slugin},
     title = {S. {L.~Sobolev's} {Hilbert} space as a variational structure},
     journal = {Doklady Akademii Nauk},
     pages = {261--264},
     year = {1970},
     volume = {194},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_194_2_a4/}
}