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Revista Cubana de Física, [S.l.], v. 29, n. 1E, p. 1E45-1E47, aug. 2012.
ISSN 2224-7939.
Available at: <http://revistacubanadefisica.org/index.php/rcf/article/view/RCF_29-1E_045_2012>. Date accessed: 07 may 2024.