@article{DE_1987_23_5_a9,
     author = {A. M. Nurmatov},
     title = {On the exponential indices of a triangular system and its diagonal approximation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {814--818},
     publisher = {mathdoc},
     volume = {23},
     number = {5},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_5_a9/}
}