Man-machine language (MML) : recommendation Z.301 - Z.341/International Telecommunication Union
International telecommunication regulations : final acts of the world administrative telegraph and telephone conference: Melbourne, 1988: (WATTC-88)
Functional specification and description language (SDL) : criteria for using formal description techniques (FDTs): recommendation Z.100 and annexes A, B, C and E, recommendation Z.110 / International Telecommunications Union
Annuaire statistique des télécommunications du secteur public : (séries chronologiques 1978-1987) / Union Internationale des Télécommunications
Annex F.2 to recommendation Z.100 : SDL formal definition: static semantics/International Telecommunication Union
Report of the administrative council to the plenipotenciary conference : section 5.2.1: Nice 1989 / International Telecommunication Union
Annex F.1 to recommendation Z.100 : SDL formal definition: introduction/International Telecommunication Union
Annex F.3 to recommendation Z.100 : SDL formal definition: dynamic semantics/International Telecommunication Union
CCITT high level language (CHILL) : international standard ISO/IEC 9496: recommendation Z.200/International Telecommunication Union