The development of the telephone in europe / Herbert Laws Webb, M.I.E.E.; Harold Cox
Rede digital com integração de serviços / Telecom Portugal; Direcção Comercial
Communication equipments of Japan / Taizo Ishizaka; The Federation of Japan Electric Communication Industrial Associations
La formation initiale d'un ingenieur dans la domaine des telecommunications / Ecole Nationale Supérieure des Télécommunications de BRetagne