@Article{JNMA-1-11,
author = {Benterki , Rebiha and Llibre , Jaume},
title = {Periodic Solutions of the Duffing Differential Equation Revisited via the Averaging Theory},
journal = {Journal of Nonlinear Modeling and Analysis},
year = {2021},
volume = {1},
number = {1},
pages = {11--26},
abstract = {<p style="text-align: justify;">We use three different results of the averaging theory of first order for studying the existence of new periodic solutions in the two Duffing differential equations $\ddot y+ a \sin y= b \sin t$ and $\ddot y+a y-c y^3=b\sin t$, where $a$, $b$ and $c$ are real parameters.</p>},
issn = {2562-2862},
doi = {https://doi.org/10.12150/jnma.2019.11},
url = {http://global-sci.org/intro/article_detail/jnma/18865.html}
}