2631-2786 2631-2786 S2631-27862021000200011 10.35290/rcui.v8n2.2021.267 Ecuador Venezuela 00 08 2021 00 08 2021 8 2 11 27

2010 19 2003 1994 66 66 2007 1993 2002 1989 2000 13 130 130 56-60 2011 1988 1999 2011 1255-70 1997 1987 2010 2006 2006 1ª 1993