1990-8644 1990-8644 S1990-86442020000600172 Venezuela 00 12 2020 00 12 2020 16 77 172 183

2009 1998 2000 2015 2002 2001 1998 1999 1985 2000 1990 2006 1989 2004 2002 2002 1997 1996 1999