1981-8106 1981-8106 S1981-81062017000300575 10.18675/1981-8106.vol27.n56.p575-591 Brazil 00 09 2017 00 09 2017 27 56 575 591

35 129 129 1205-222 18 2 2 113-18 35 129 129 999-1026 22 80 80 121-34