LOUREIRO, Caroline Vitor; PARENTE, Karlos Markes N.; SOUSA, CĂ­cera Inara Oliveira. Thesis and Dissertation. Mercator, Fortaleza, v. 11, n. 24, p. 271 a 273, apr. 2012. ISSN 1984-2201. Available at: <http://www.mercator.ufc.br/mercator/article/view/847>. Date accessed: 27 may 2020.