@article{DE_1982_18_8_a1,
     author = {B. F. Bylov},
     title = {A method for the quasitriangularization of a system in connection with the estimation of central and characteristic indices},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1298--1306},
     publisher = {mathdoc},
     volume = {18},
     number = {8},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1982_18_8_a1/}
}