@article{DAN_1969_188_3_a10,
     author = {V. V. Strygin},
     title = {Peculiarities of the averaging principle for evolution equations},
     journal = {Doklady Akademii Nauk},
     pages = {535--537},
     publisher = {mathdoc},
     volume = {188},
     number = {3},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_188_3_a10/}
}