0186-7210 0186-7210 S0186-72102005000100071 10.24201/edu.v20i1.1230 00 04 2005 00 04 2005 20 1 71 101

2000 2003 2003 37 3 3 501-18 1977 131-52 INEGI 1997 INEGI 1997 2000 1993 2 2 1977 153-74 1995