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ISSN 2224-7939.
Available at: &lt;<a href="http://revistacubanadefisica.org/index.php/rcf/article/view/RCF_29-2_57_2012" target="_new">http://revistacubanadefisica.org/index.php/rcf/article/view/RCF_29-2_57_2012</a>&gt;. Date accessed: 02 may 2024.