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<strong>Revista Cubana de Física</strong>, [S.l.], v. 37, n. 1, p. 49-51, july 2020.
ISSN 2224-7939.
Available at: &lt;<a href="http://revistacubanadefisica.org/index.php/rcf/article/view/2020v37p49" target="_new">http://revistacubanadefisica.org/index.php/rcf/article/view/2020v37p49</a>&gt;. Date accessed: 19 apr. 2024.