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@article{DE_1973_9_2_a27, author = {V. P. Prokop'ev}, title = {The stability of motion in the critical case of $2k$ zero roots}, journal = {Differencialʹnye uravneni\^a}, pages = {383--385}, publisher = {mathdoc}, volume = {9}, number = {2}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1973_9_2_a27/} }
V. P. Prokop'ev. The stability of motion in the critical case of $2k$ zero roots. Differencialʹnye uravneniâ, Tome 9 (1973) no. 2, pp. 383-385. http://geodesic.mathdoc.fr/item/DE_1973_9_2_a27/