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@article{DE_1965_1_12_a6, author = {V. I. Zhukovskii}, title = {Instability and conditional stability in the critical case of $n$ zero roots}, journal = {Differencialʹnye uravneni\^a}, pages = {1601--1605}, publisher = {mathdoc}, volume = {1}, number = {12}, year = {1965}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1965_1_12_a6/} }
V. I. Zhukovskii. Instability and conditional stability in the critical case of $n$ zero roots. Differencialʹnye uravneniâ, Tome 1 (1965) no. 12, pp. 1601-1605. http://geodesic.mathdoc.fr/item/DE_1965_1_12_a6/