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@article{AA_1989_1_2_a6, author = {V. F. Lazutkin}, title = {Analytic integrals of a~semistandard mapping, and separatrix splitting}, journal = {Algebra i analiz}, pages = {116--131}, publisher = {mathdoc}, volume = {1}, number = {2}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AA_1989_1_2_a6/} }
V. F. Lazutkin. Analytic integrals of a~semistandard mapping, and separatrix splitting. Algebra i analiz, Tome 1 (1989) no. 2, pp. 116-131. http://geodesic.mathdoc.fr/item/AA_1989_1_2_a6/