0124-2253 0124-2253 S0124-22532018000200157 10.14483/23448350.128330 Mexico 00 08 2018 00 08 2018 32 157 168

2015 49 1 1 21-39 2001 67 654 654 267-72 2005 2005 39 5 5 339-50 2003 2002 1993 43 4 4 19-24 2009 59 6 6 55-60 2011 6 1 1 373-85 2012 7 1 1 925-35 2012 70 1 1 155-63 2016 50 4 4 833-44 2011 2004 62 6 6 452-4 2001 67 656 656 757-62 1993 39 9 9 985-92 2006 International Organization for Standardization 2012 International Organization for Standardization 2014 2006 8 2 2 83-92 2014 9 4 4 6614-26 2013 58 4 4 617-26 2004 36 2 2 210-5 2008 66 6 6 439-46 2013 48 24 24 8530-8 2015 69 7 7 863-73 2000 54 3 3 287-93 2010 97 10 10 1587-94 1999 33 4 4 341-51 2006 78 78 67-76 2007 2009 54 2 2 1-18 2015 2016 6 2 2 162-71 2017 43 2 2 156-64 2016 12 1 1 36-51 2014 10 1 1 4-35 2013 9 1 1 3-20 2014 62 62 17-33 2004 50 5 5 333-40 2012 7 4 4 5581-92 2007 41 2 2 117-31