Terminal equipment and protocols for telematic services : recommendations T.0 - T.63 / International Telecommunication Union
Conformance testing procedures for the teletex recommendations : recommendations T.64 / International Telecommunication Union
Terminal equipment and protocols for telematic services : recommendations T.400 - T.418 / International Telecommunication Union
Terminal equipment and protocols for telematic services : recommendations T.431 - T.564 / International Telecommunication Union