@article{DE_1974_10_5_a0,
     author = {P. S. Belevets and R. T. Valeeva},
     title = {A qualitative study in the large of a certain dynamical system with two algebraic integrals in the form of hyperbolas},
     journal = {Differencialʹnye uravneni\^a},
     pages = {771--777},
     publisher = {mathdoc},
     volume = {10},
     number = {5},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1974_10_5_a0/}
}