KOUTANDOS, Spyridon.
 Some Examples of Formation of Shells and Their Role in Establishment of Equilibrium.
<strong>European Journal of Physics Education</strong>, [S.l.], v. 3, n. 1, p. 30-35, mar. 2017.
ISSN 1309-7202.
Available at: &lt;<a href="https://eu-journal.org/index.php/EJPE/article/view/105" target="_new">https://eu-journal.org/index.php/EJPE/article/view/105</a>&gt;. Date accessed: 06 may 2024.