Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1971_198_6_a4, author = {V. V. Laricheva}, title = {Averaging for systems with variable period}, journal = {Doklady Akademii Nauk}, pages = {1269--1272}, publisher = {mathdoc}, volume = {198}, number = {6}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1971_198_6_a4/} }
V. V. Laricheva. Averaging for systems with variable period. Doklady Akademii Nauk, Tome 198 (1971) no. 6, pp. 1269-1272. http://geodesic.mathdoc.fr/item/DAN_1971_198_6_a4/