@article{DE_1997_33_2_a2,
     author = {M. V. Dolov},
     title = {An integrating factor in a neighborhood of a node},
     journal = {Differencialʹnye uravneni\^a},
     pages = {158--160},
     publisher = {mathdoc},
     volume = {33},
     number = {2},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_2_a2/}
}