1982-9949 1982-9949 S1982-99492017000100005 10.17058/rea.v25i1.3547 Portugal Portugal 00 04 2017 00 04 2017 25 1 5 21

22 23 23 59-71 20 1 1 192-208 7 131 131 531-34 23 2 2 190-98 3 3 6-12 3 21 21 698-709