2007-8110 2007-8110 S2007-81102020000200491 00 00 2020 00 00 2020 15 29 491 509 1982 2019 2011 1996 Educatina 2009 2009 2001 1986 478-94 2018 2019 105 2010 40 40 197-205 2014 2010 2019 53 53 2012 CIESAS de Oaxaca 2000 2015 2014 1 42 42 228-41 2011 2000 73-91 1997 1978 135-56