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@article{DAN_1990_311_3_a8, author = {D. I. Petrov}, title = {Conditions for the applicability of the method of harmonic balance}, journal = {Doklady Akademii Nauk}, pages = {553--556}, publisher = {mathdoc}, volume = {311}, number = {3}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1990_311_3_a8/} }
D. I. Petrov. Conditions for the applicability of the method of harmonic balance. Doklady Akademii Nauk, Tome 311 (1990) no. 3, pp. 553-556. http://geodesic.mathdoc.fr/item/DAN_1990_311_3_a8/