1809-3876 1809-3876 S1809-38762017000100004 10.23925/1809-3876.2017v15i1p4-24 Spain Spain Spain 00 03 2017 00 03 2017 15 1 4 24

374 17-20 12 2 2 103-19 76 76 7-21 14 1 1 101-14 8 16 16 195-209 15 4 4 107-33