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@article{DE_1999_35_12_a5, author = {I. N. Sergeev}, title = {The rotation method and singular numbers of three-dimensional systems}, journal = {Differencialʹnye uravneni\^a}, pages = {1630--1639}, publisher = {mathdoc}, volume = {35}, number = {12}, year = {1999}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1999_35_12_a5/} }
I. N. Sergeev. The rotation method and singular numbers of three-dimensional systems. Differencialʹnye uravneniâ, Tome 35 (1999) no. 12, pp. 1630-1639. http://geodesic.mathdoc.fr/item/DE_1999_35_12_a5/