MEI, Wai-Ning.
 Systematic Convergence in Applying Variational Method to Double-Well Potential.
<strong>European Journal of Physics Education</strong>, [S.l.], v. 7, n. 2, p. 28-44, feb. 2017.
ISSN 1309-7202.
Available at: &lt;<a href="https://eu-journal.org/index.php/EJPE/article/view/44" target="_new">https://eu-journal.org/index.php/EJPE/article/view/44</a>&gt;. Date accessed: 19 apr. 2024.