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@article{AA_1998_10_2_a2, author = {Yu. N. Bibikov}, title = {Bifurcation of the generation of invariant tori with infinitesimal frequency}, journal = {Algebra i analiz}, pages = {81--92}, publisher = {mathdoc}, volume = {10}, number = {2}, year = {1998}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AA_1998_10_2_a2/} }
Yu. N. Bibikov. Bifurcation of the generation of invariant tori with infinitesimal frequency. Algebra i analiz, Tome 10 (1998) no. 2, pp. 81-92. http://geodesic.mathdoc.fr/item/AA_1998_10_2_a2/