2073-6061 2073-6061 S2073-60612020000100011 Cuba Ecuador Ecuador 00 06 2020 00 06 2020 14 1

2005 2017 19 11 11 311-8 Empresa de Gases 2012 2010 2017 11 2 2 91-101 2012 2010 2018 13 1 1 2-13 2017 2007 2017 2010