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Revista Cubana de Física, [S.l.], v. 29, n. 2, p. 70-73, dec. 2012.
ISSN 2224-7939.
Available at: <http://www.revistacubanadefisica.org/index.php/rcf/article/view/RCF_29-2_70_2012>. Date accessed: 15 may 2024.