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@article{DAN_1969_184_4_a15, author = {V. I. Cherepanov}, title = {The parametrization method in the perturbation theory for systems with $SR$-symmetry}, journal = {Doklady Akademii Nauk}, pages = {820--823}, publisher = {mathdoc}, volume = {184}, number = {4}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1969_184_4_a15/} }
V. I. Cherepanov. The parametrization method in the perturbation theory for systems with $SR$-symmetry. Doklady Akademii Nauk, Tome 184 (1969) no. 4, pp. 820-823. http://geodesic.mathdoc.fr/item/DAN_1969_184_4_a15/