1981-8106 1981-8106 S1981-81062015000300534 10.2015/maio.ago.v25n50.534 Brazil Brazil 00 09 2015 00 09 2015 25 50 534 548

38 135 135 779-96 6 1 1 45-53 30 108 108 716-78 12 34 34 152-65 21 55 55 9-29