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<strong>Mercator</strong>, Fortaleza, v. 11, n. 24, p. 271 a 273, apr. 2012.
ISSN 1984-2201.
Available at: &lt;<a href="http://www.mercator.ufc.br/mercator/article/view/847" target="_new">http://www.mercator.ufc.br/mercator/article/view/847</a>&gt;. Date accessed: 01 may 2025.