1981-8106 1981-8106 S1981-81062016000200295 10.18675/1981-8106.vol26.n52.p295-311 Brazil Brazil 00 08 2016 00 08 2016 26 52 295 311

2 6 6 1 3 3 37-45 33 121 121 1037-052 18 52 52 18 1 1 42-58 33 118 118 253-68 24 47 47 171-90