1870-199X 1870-199X S1870-199X2006000400181 10.22201/fo.1870199xp.2006.10.4.15893 Mexico Mexico Mexico 00 00 2006 00 00 2006 10 4 181 189

1 1999 8 29-34 2 1999 11 15-9 3 1999 11 1-13 4 2000 38 1 1 77-84 5 2001 30 123-9 6 1980 85-109 7 1997 167-77 8 1999 11 165-79 9 1986 44 100-3