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@article{DE_1975_11_9_a8, author = {N. I. Yatskin}, title = {The periodic solutions of linear equations in differential forms}, journal = {Differencialʹnye uravneni\^a}, pages = {1607--1619}, publisher = {mathdoc}, volume = {11}, number = {9}, year = {1975}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1975_11_9_a8/} }
N. I. Yatskin. The periodic solutions of linear equations in differential forms. Differencialʹnye uravneniâ, Tome 11 (1975) no. 9, pp. 1607-1619. http://geodesic.mathdoc.fr/item/DE_1975_11_9_a8/