@article{DE_1989_25_4_a10,
     author = {A. I. Yablonskii and A. F. Korzyuk},
     title = {Classes of third-order systems with quadratic right-hand sides without moving critical points},
     journal = {Differencialʹnye uravneni\^a},
     pages = {635--640},
     publisher = {mathdoc},
     volume = {25},
     number = {4},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_4_a10/}
}