1405-3195 1405-3195 S1405-31952018000200279 Mexico Mexico 00 03 2018 00 03 2018 52 2 279 291

1965 23 1-278 2016 11 1974 1972 ^s7 ^s7 7 9-35 1993 47 47 1977 17-25 1977 2012 18 7-21 2014 46 1197-202 2016 7 1-17 1996 12 279-91 1967 15 5-96 2002 721 632-5 1972 2 317-26 2008 65 706 2005 39 117-26 2012 31 49-58 1969 7 111-5 2010 33 297-304 2007 4 2013 8 1985 1956 34 27-36 2007 16 727-42 2006 8 13-6 2010 1 31-8 2013 36 155-62 2000 78 928-40 2004 5 571-83 2005 35 383-400 2007 37 260-75 1991 1991 2002 80 1173-84 1985 15 341-7 2012 46 519-34 SAS Institute Inc. 2012 2003 1980 19 19 2004 2005 46 41-3 2007 1975 7 7