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@article{DE_1984_20_6_a21, author = {G. I. Kabak}, title = {Lower bounds for the minimum number of switching points}, journal = {Differencialʹnye uravneni\^a}, pages = {1088--1090}, publisher = {mathdoc}, volume = {20}, number = {6}, year = {1984}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1984_20_6_a21/} }
G. I. Kabak. Lower bounds for the minimum number of switching points. Differencialʹnye uravneniâ, Tome 20 (1984) no. 6, pp. 1088-1090. http://geodesic.mathdoc.fr/item/DE_1984_20_6_a21/