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@article{DE_1972_8_12_a6, author = {V. V. Zhikov}, title = {The stability and instability of {Levinson's} center}, journal = {Differencialʹnye uravneni\^a}, pages = {2167--2170}, publisher = {mathdoc}, volume = {8}, number = {12}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1972_8_12_a6/} }
V. V. Zhikov. The stability and instability of Levinson's center. Differencialʹnye uravneniâ, Tome 8 (1972) no. 12, pp. 2167-2170. http://geodesic.mathdoc.fr/item/DE_1972_8_12_a6/