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<strong>Revista Cubana de Física</strong>, [S.l.], v. 38, n. 1, p. 4-9, july 2021.
ISSN 2224-7939.
Available at: &lt;<a href="https://revistacubanadefisica.org/index.php/rcf/article/view/2021v38p004" target="_new">https://revistacubanadefisica.org/index.php/rcf/article/view/2021v38p004</a>&gt;. Date accessed: 22 sep. 2023.