New systems and services in telecommunications :  proceedings of the International Conference on New Systems and Services in Telecommunications, Liege, Belgium, November 24-26, 1980 / 
edited by G. Cantraine and J. Destine. 
 - Amsterdam :  North-Holland,  1981. 
 - 367 p. :  ill. ;  28 cm. 
<br/><br/><label>ISBN: </label>0444862064 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunication--Congresses.