@article{DE_1988_24_6_a21,
     author = {E. V. Mamotov},
     title = {Some properties of a system of first-order ordinary differential nonlinear equations with a singular matrix of constant rank in front of the vector of the derivatives},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1055--1058},
     publisher = {mathdoc},
     volume = {24},
     number = {6},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1988_24_6_a21/}
}