Kee, Richard <br/><br/>
ISDN:   The commercial benefits 

 - London:   Ovum Ltd,   1986 
 - ix, 408p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Report
<br/><br/><label>Universal Decimal Class. No.: </label>D 681.324:621.39  / M6