TY  - BOOK
AU  - Viswanathan,Thiagarajan
TI  - Telecommunication switching systems and networks
SN  - 8120307135
U1  - 004.6 VIS 
PY  - 1992///
CY  - New Delhi
PB  - Prentice Hall of India
N1  - Includes bibliographical references
ER  -