@article{DAN_1987_294_5_a15,
     author = {P. V. Elyutin},
     title = {Perturbation theory and the quasi-classical approximation in an energetic representation},
     journal = {Doklady Akademii Nauk},
     pages = {1089--1092},
     publisher = {mathdoc},
     volume = {294},
     number = {5},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_294_5_a15/}
}