Viswanathan, Thiagarajan <br/><br/>
Telcommunication Switching Systems and Networks 

 - New Delhi :  PHI Learning Private Limited,  c1992. 
 - xi, 583 p.:  [E5] 
<br/><br/><label>ISBN: </label>9788120307131 
<br/><br/><label>Dewey Class. No.: </label>621.382  / VIS/TEL