TY  - JOUR
AU  - E. S. Chichkin
TI  - On the non-oscillation of solutions of non-linear differential equations of third and fourth order
JO  - Izvestiâ vysših učebnyh zavedenij. Matematika
PY  - 1959
SP  - 219
EP  - 221
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IVM_1959_5_a22/
LA  - ru
ID  - IVM_1959_5_a22
ER  -