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<strong>Revista Cubana de Física</strong>, [S.l.], v. 29, n. 2, p. 70-73, dec. 2012.
ISSN 2224-7939.
Available at: &lt;<a href="http://revistacubanadefisica.org/index.php/rcf/article/view/RCF_29-2_70_2012" target="_new">http://revistacubanadefisica.org/index.php/rcf/article/view/RCF_29-2_70_2012</a>&gt;. Date accessed: 20 apr. 2024.