@article{DAN_1961_140_5_a6,
     author = {Joanna Maierchik},
     title = {Separatrices of plane dynamic systems},
     journal = {Doklady Akademii Nauk},
     pages = {1008--1010},
     publisher = {mathdoc},
     volume = {140},
     number = {5},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_140_5_a6/}
}