0186-0348 0186-0348 S0186-03482009000300145 10.18234/secuencia.v0i75.1092 Mexico 00 12 2009 00 12 2009 75 145 170

1950 1981 2000 2003 1995 7 3 3 291­97 1990 282­290 2000 1994 2002 2001 1965 31­33 31­33 75­97 1972 4 1990 56­62 2004 41­50 1996 128­138 1994 1964 1982 1997 1997 92­119 1999 9 2 2 147­167 1997 1994 2005 81-4 2004 1981 1 1993 2 1986 2001 2005 20 20 11­35 1993 1995 7 3 3 256­263