@article{VYURM_2020_12_4_a3,
     author = {V. Sh. Roitenberg},
     title = {On polynomial differential equations of the second order on a circle without singular points},
     journal = {Vestnik \^U\v{z}no-Uralʹskogo gosudarstvennogo universiteta. Seri\^a, Matematika, mehanika, fizika},
     pages = {33--40},
     publisher = {mathdoc},
     volume = {12},
     number = {4},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VYURM_2020_12_4_a3/}
}