@article{DAN_1957_116_4_a2,
     author = {A. E. Gel'man},
     title = {The reducibility of a certain class of simultaneous differential equations containing quasiperiodic coefficients},
     journal = {Doklady Akademii Nauk},
     pages = {535--537},
     publisher = {mathdoc},
     volume = {116},
     number = {4},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_116_4_a2/}
}