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@article{DE_1989_25_6_a29, author = {V. P. Ruzaev}, title = {On the bifurcation of an invariant torus $\mathbf T^m\to\mathbf T^{m+1}$}, journal = {Differencialʹnye uravneni\^a}, pages = {1066--1069}, publisher = {mathdoc}, volume = {25}, number = {6}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1989_25_6_a29/} }
V. P. Ruzaev. On the bifurcation of an invariant torus $\mathbf T^m\to\mathbf T^{m+1}$. Differencialʹnye uravneniâ, Tome 25 (1989) no. 6, pp. 1066-1069. http://geodesic.mathdoc.fr/item/DE_1989_25_6_a29/