@article{DAN_1995_340_3_a5,
     author = {A. K. Lopatin and S. R. Belkina},
     title = {A new criterion for the decomposability of a differential system},
     journal = {Doklady Akademii Nauk},
     pages = {311--313},
     publisher = {mathdoc},
     volume = {340},
     number = {3},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1995_340_3_a5/}
}