ISSLS 80 : the International Symposium on Subscriber Loops and Services, September 15-19, 1980, Munich, Federal Republic of Germany : proceedings / organized by NTG (Nachrichtentechnische Gesellschaft im VDE) ... [et al.]. (NTG-Fachberichte ; Bd. 73)
ISSLS 80 : the International Symposium on Subscriber Loops and Services, September 15-19, 1980, Munich, Federal Republic of Germany : proceedings / organized by NTG (Nachrichtentechnische Gesellschaft im VDE) ... [et al.].