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@article{DE_1978_14_5_a14, author = {L. N. Gaishun}, title = {Periodic solutions of linear completely integrable systems}, journal = {Differencialʹnye uravneni\^a}, pages = {905--907}, publisher = {mathdoc}, volume = {14}, number = {5}, year = {1978}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1978_14_5_a14/} }
L. N. Gaishun. Periodic solutions of linear completely integrable systems. Differencialʹnye uravneniâ, Tome 14 (1978) no. 5, pp. 905-907. http://geodesic.mathdoc.fr/item/DE_1978_14_5_a14/