@article{DE_1994_30_5_a23,
     author = {U. D. Bekbaev},
     title = {On equivalence and invariants of ordinary linear differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {911--912},
     publisher = {mathdoc},
     volume = {30},
     number = {5},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1994_30_5_a23/}
}