0120-419X 0120-419X S0120-419X2020000200004 10.18273/revint.v38n2-2020004 México México México 00 12 2020 00 12 2020 38 2 109 117

[1] 2003 18 2 2 235-62 [2] 1998 46 1 1 5-9 [3] 2002 28 4 4 781-805 [4] 1999 216 [5] 1951 71 152-82