@article{DE_1977_13_6_a8,
     author = {A. D. Myshkis and V. G. \`Eventov},
     title = {A geometric treatment of the oscillatory properties of third order linear differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1047--1052},
     publisher = {mathdoc},
     volume = {13},
     number = {6},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_6_a8/}
}