Roio, Marcos Tadeu Del [UNESP]2015-02-242015-02-242011PUC Viva, v. 12, n. 41, p. 55-60, 2011.1806-3667http://hdl.handle.net/11449/11521955-60porArtigoAcesso abertoISSN18063667-2011-12-41-55-60.pdf1034829852338994