@article{02010105,
title = {Existence conditions for periodic solutions of nonlinear third-order differential equations.},
journal = {Matematichki Vesnik},
volume = {52},
year = {2000},
pages = {79-82},
zbl = {1041.34029},
language = {en},
url = {http://dml.mathdoc.fr/item/02010105}
}
Knežević-Miljanović, Julka. Existence conditions for periodic solutions of nonlinear third-order differential equations.. Matematichki Vesnik, Tome 52 (2000) pp. 79-82. http://gdmltest.u-ga.fr/item/02010105/