1809-3876 1809-3876 S1809-38762016000401484 10.23925/1809-3876.2016v14i4p1484 Portugal 00 12 2016 00 12 2016 14 4 1484 1498

14 03 03 809-36 102 55-67 8 1 1 168-88 14 03 03 837-63