1982-9949 1982-9949 S1982-99492016000300070 10.17058/rea.v24i3.7545 Brasil Brazil 00 12 2016 00 12 2016 24 3 70 84

45 45 66-71 3 1 1 85-96 08 08 7-22 12 34 34 94-103