@article{IVM_1959_5_a22,
     author = {E. S. Chichkin},
     title = {On the non-oscillation of solutions of non-linear differential equations of third and fourth order},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {219--221},
     publisher = {mathdoc},
     number = {5},
     year = {1959},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1959_5_a22/}
}