1982-9949 1982-9949 S1982-99492015000200250 10.17058/rea.v23i2.2503 Brazil 00 08 2015 00 08 2015 23 2 250 268

17 17 113-34 26 91 91 443-64 74 3 3 221-21 28 98 98 271-78 44 1 1 57-83