@article{106978,
author = {Bahman Mehri},
title = {A note on periodic solution of second order non-linear differential equations},
journal = {Archivum Mathematicum},
volume = {013},
year = {1977},
pages = {191-194},
zbl = {0394.34034},
mrnumber = {0477244},
language = {en},
url = {http://dml.mathdoc.fr/item/106978}
}
Mehri, Bahman. A note on periodic solution of second order non-linear differential equations. Archivum Mathematicum, Tome 013 (1977) pp. 191-194. http://gdmltest.u-ga.fr/item/106978/
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