1981-8106 1981-8106 S1981-81062017000200428 10.18675/1981-8106.vol27.n55.p428-450 Brazil Brazil 00 08 2017 00 08 2017 27 55 428 450

6 1837-840 369 499-507 13 11-30 12 10 10 901-05 12 42-50 378 355-59 51 312 312 56-7 3 2771-780