@article{DE_1971_7_5_a0,
     author = {\`E. I. Grudo},
     title = {A representation of the solutions of a certain system of differential equations with periodic coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {771--781},
     publisher = {mathdoc},
     volume = {7},
     number = {5},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_5_a0/}
}