HE, Ji-Huan.
 A parametrized variational principle of nonlinear piezoelectricity.
<strong>Computer Assisted Methods in Engineering and Science</strong>, [S.l.], v. 10, n. 3, p. 263-269, jan. 2023.
ISSN 2956-5839.
Available at: &lt;<a href="https://cames.ippt.pan.pl/index.php/cames/article/view/1074" target="_new">https://cames.ippt.pan.pl/index.php/cames/article/view/1074</a>&gt;. Date accessed: 03 july 2024.