Abstract

We are writing to comment briefly on the article ‘‘Bifurcation analysis of parametrically excited bipolar disorder model” by Laurent Nana, which was accepted for publication in 2007 and is presently available online among the officially forthcoming articles in Communications in Nonlinear Science and Numerical Simulation [2]. In the article, Laurent Nana models the mood swings of a patient as a van der Pol oscillator with autonomous forcing. Specifically, he considers

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