@article{DE_1980_16_12_a4,
     author = {V. B. Pilyugina},
     title = {On a system with a triple zero root of the characteristic {equation.~I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2148--2155},
     publisher = {mathdoc},
     volume = {16},
     number = {12},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1980_16_12_a4/}
}