1982-9949 1982-9949 S1982-99492017000300049 10.17058/rea.v25i3.9739 Brazil Brazil 00 12 2017 00 12 2017 25 3 49 67

32 1 1 109-22 14 1 1 42-52 4 1 1 10-8 2 2 2 246-67 5 4 4 379-93 2 5 5 135-53