@article{DAN_1958_123_1_a3,
     author = {K. A. Breus},
     title = {On the reducibility of a canonical system of differential equations with periodical coefficients},
     journal = {Doklady Akademii Nauk},
     pages = {21--24},
     publisher = {mathdoc},
     volume = {123},
     number = {1},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_123_1_a3/}
}