@article{DAN_1969_188_6_a9,
     author = {V. V. Laricheva},
     title = {A new algorithm for obtaining higher approximations in the method of averaging},
     journal = {Doklady Akademii Nauk},
     pages = {1237--1240},
     year = {1969},
     volume = {188},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_188_6_a9/}
}