1607-4041 1607-4041 S1607-40412018000400086 10.24320/redie.2018.20.4.1999 Mexico 00 12 2018 00 12 2018 20 4 86 99

2000 1988 39 38-42 2007 39 719-39 1997 51 1 1 43-57 1994 12 239 2011 1-10 2005 2-12 2010 7-20 2015 4 1988 27 190-4 2000 18-20 1998 5 3 3 39-45 2003 1990 19 9 9 17-21 1991 61 4 4 505-32 2006 1989 118-28 2007 Indianapolis, IN 2003 2005 9 5-12 2002 2008 17 4 4 254-8 2008 61-82 2000 8 2 2 145-70 1988 23 3 3 183-9