@article{DE_1970_6_12_a7,
     author = {G. S. Rychkov},
     title = {A complete investigation of the number of limit cycles of the equation $(b_{10}x+y)dy=\sum_{i+j\ge1}^2a_{ij}x^iy^jdx$},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2193--2199},
     publisher = {mathdoc},
     volume = {6},
     number = {12},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1970_6_12_a7/}
}