1405-3322 1405-3322 S1405-33222007000200203 10.18268/bsgm2007v59n2a5 Mexico Mexico Mexico Mexico 00 00 2007 00 00 2007 59 2 203 217

2004 21/1 9-17 1990 110 1995 92 2005 211-30 1997 377 2003 57-66 1985 2005 121-62 1987 12 4 4 231-55 1997 636 1997 12 3 3 177-210 1990 1 2 2 117-32 2003 1968 11-28 1974 5 35-69 2007 2003 20 235-44 1998 343 2006 45 85-98 2007 30 1 1 6-11 1987 19 1996 4 4 13-37 1997 2003 20 270-82 2005 47 159-75 1960 7 317-27 2007 247 272-95 1973 1975 2007 1993 362 48-51 1972 32 2003 2006 7 1964 13 31-57 1965 1979 2006 156-157 13-31 2004 97-123 2003 8-10 2006 2001 19 50-65 2001 28 541-53 1990 41-62