2395-9169 2395-9169 S2395-91692022000200113 10.24836/es.v32i60.1248 Ecuador 00 12 2022 00 12 2022 32 60

2016 2008 2012 10 1 1 57-64 2016 2004 2007 2014 2011 2014 2020 11 1 1 12-8 2022 9 02 02 1993 2003 53 2 2 133-44 1958 272 7039 7039 214 1990 2004 85 1 1 73-80 2017 2012 43 4 4 79-81 NTE INEN (Ecuadorian Institute of Standardization) 2014 NTE INEN (Ecuadorian Institute of Standardization) 2010 NTE INEN (Ecuadorian Institute of Standardization) 2010 2011 9 35-42 2011 2015 13 1 1 60-5 2007 2016 2014 1 2007 34 2011 2006 1 2010 60 2 2