@article{DE_1976_12_11_a3,
     author = {M. V. Dolov},
     title = {The canonical integral in the neighborhood of a focus},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1946--1953},
     publisher = {mathdoc},
     volume = {12},
     number = {11},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_11_a3/}
}