1680-0338 1680-0338 S1680-03382021000300003 Ecuador Ecuador 00 12 2021 00 12 2021 42 3 3 21

2012 41 2 2 243-62 2017 28 2 2 59-72 AWWA Staff 2011 4th 2011 27 4 4 313-21 2017 30 4 4 15-27 2013 118 54-67 Ministerio del Ambiente del Ecuador 2015 Edición Especial Nº316 2012 3 3 3 1194-207 2010 3 4 4 19.28