2616-7964 2616-7964 S2616-79642021000400193 10.33996/revistahorizontes.v5i20.264 Ecuador 00 09 2021 00 09 2021 5 20 193 204

1996 2009 2018 11 11 259-74 2009 1 19 19 7-24 2017 2018 2019 2016