1405-5546 1405-5546 S1405-55462017000100137 10.13053/cys-21-1-2301 Cuba Cuba Cuba 00 03 2017 00 03 2017 21 1 137 146

1993 2008 5 16 16 Telecommunication Standardization Sector of ITU 2007 1989 2001 2004 2000 2009 1998 2008 2006 2006