@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/}
}