@article{DE_1967_3_2_a4,
     author = {A. I. Zaitsev},
     title = {Analytic form of solutions of linear systems of differential equations with quasi-periodic coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {219--225},
     publisher = {mathdoc},
     volume = {3},
     number = {2},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_2_a4/}
}