Comparison of <i>f</i>′′(0) of the present results (in brackets) with the previous published work [3] when <i>γ</i> = 0 and <i>Ha</i> = 0.

<p>Comparison of <i>f</i>′′(0) of the present results (in brackets) with the previous published work [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0156955#pone.0156955.ref003" target="_blank">3</a>] when <i>γ</i> = 0 and <i>Ha</i> = 0.