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@article{MZM_1996_60_4_a15, author = {A. Yu. Kolesov}, title = {A~four-dimensional analog of {Lyapunov's} classical stability problem}, journal = {Matemati\v{c}eskie zametki}, pages = {612--615}, publisher = {mathdoc}, volume = {60}, number = {4}, year = {1996}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1996_60_4_a15/} }
A. Yu. Kolesov. A~four-dimensional analog of Lyapunov's classical stability problem. Matematičeskie zametki, Tome 60 (1996) no. 4, pp. 612-615. http://geodesic.mathdoc.fr/item/MZM_1996_60_4_a15/