0185-1616 0185-1616 S0185-16162020000100113 10.22201/fcpys.24484903e.2020.49.72402 Mexico 00 04 2020 00 04 2020 49 113 130

1991 1995 1990 1993 1997 1990 1979 1984 1989 2001 1978 2001 1987 1968 1990 1980 2001 1987 1961