@Article{AAMM-1-383,
author = {Mickens , Ronald E. and Wilkerson , Dorian},
title = {Exact and Approximate Values of the Period for a "Truly Nonlinear" Oscillator: $\ddot{x} + x + x^{1/3} = 0$},
journal = {Advances in Applied Mathematics and Mechanics},
year = {2009},
volume = {1},
number = {3},
pages = {383--390},
abstract = {<p style="text-align: justify;">We investigate the mathematical properties of a &quot;truly nonlinear&quot; oscillator
differential equation. In particular, using phase-space methods, it is shown
that all solutions are periodic and the fixed-point is a nonlinear center. We calculate
both exact and approximate analytical expressions for the period, where the exact
solution is given in terms of elliptic functions and the method of harmonic balance
is used to calculate the approximate formula.</p>},
issn = {2075-1354},
doi = {https://doi.org/},
url = {http://global-sci.org/intro/article_detail/aamm/8376.html}
}