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@article{DAN_1981_258_4_a9, author = {M. A. Brutyan and S. V. Lyapunov}, title = {On the second variation of the {Riabouschinsky} functional}, journal = {Doklady Akademii Nauk}, pages = {812--814}, publisher = {mathdoc}, volume = {258}, number = {4}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1981_258_4_a9/} }
M. A. Brutyan; S. V. Lyapunov. On the second variation of the Riabouschinsky functional. Doklady Akademii Nauk, Tome 258 (1981) no. 4, pp. 812-814. http://geodesic.mathdoc.fr/item/DAN_1981_258_4_a9/