1981-8106 1981-8106 S1981-81062017000300611 10.18675/1981-8106.vol27.n56.p611-627 Portugal 00 09 2017 00 09 2017 27 56 611 627

10 10 53-64 6 2 2 101-03 12-13 12-13 13-26 25 1 1 127-48 22 2 2 53-84 11 11 111-26 4 4 77-86