1982-9949 1982-9949 S1982-99492014000200220 10.17058/rea.v22i2.0220 Brazil Brazil 00 12 2014 00 12 2014 22 2 220 253

27 72 72 20 68 68 24 85 85 20 52 52 61-104 1 9 9 27-33 11 47 47 9-34 1 21 21 137-57 25 25 65-76