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@article{DE_1985_21_12_a22, author = {V. F. Lisyanoi}, title = {Classification of formal periodic systems}, journal = {Differencialʹnye uravneni\^a}, pages = {2173--2175}, publisher = {mathdoc}, volume = {21}, number = {12}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1985_21_12_a22/} }
V. F. Lisyanoi. Classification of formal periodic systems. Differencialʹnye uravneniâ, Tome 21 (1985) no. 12, pp. 2173-2175. http://geodesic.mathdoc.fr/item/DE_1985_21_12_a22/