1982-9949 1982-9949 S1982-99492015000200025 10.17058/rea.v23i2.6077 Brazil Brazil 00 08 2015 00 08 2015 23 2 25 53

1 20 20 319-35 14 1 1 59-67 4 7 7 169-75 8 8 8 183-219 17 47 47 8 8 8 171-81