UIT-T mire No.5 : cette mire est produite par procédé photographique
Yearbook of statistics : telecommunication services: chronological time series 1990-1999 / International Telecommunication Union
Yearbook of statistics : telecommunication services: chronological time series 1995-2004 / International Telecommunication Union
International telecommunication regulations : final acts of the world administrative telegraph and telephone conference: Melbourne, 1988: (WATTC-88)