New systems and services in telecommunications 
/ Proceedings of the International Conference on New Systems and Services in Telecommunications, Liège, Belgium, November 24-26, 1980 
 - Amsterdam:   North-Holland Publishing Company,   1981 
 - viii, 367p. 
<br/><br/><label>ISBN: </label>0444862064 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunication
<br/><br/><label>Universal Decimal Class. No.: </label>621.39(082.2)  / M1