1982-7806 1982-7806 S1982-78062019000100003 10.14393/che-v18n1-2019-1 00 01 2019 00 01 2019 18 1 3 8 2007 2012 2012 9-22 2015 7-18 2012 39 2006 1-15 2010 26 02 02 189-208 MINAS GERAIS 1891