@article{DAN_1976_228_1_a13,
     author = {V. V. Petrov and A. A. Gordeev},
     title = {Investigation of high-order nonlinear systems on a multisheet phase plane},
     journal = {Doklady Akademii Nauk},
     pages = {59--61},
     publisher = {mathdoc},
     volume = {228},
     number = {1},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_228_1_a13/}
}