2301-1513 2301-1513 S2301-15132021000201302 10.18861/ania.2021.11.2.3143 Ecuador Ecuador 00 00 2021 00 00 2021 11 2

2008 2015 1990 2010 15 15 15 94-101 2007 1999 OBS 2018 PMI 2018 2010