TY  - BOOK
AU  - Viswanathan Thiagarajan
AU  -  Bhatnagar Manav
TI  - Telecommunication switching systems and networks
U1  - D65,4, Q5;1-2 
PY  - 2015///
CY  - Delhi
PB  - PHI Learning      
KW  - I I C
ER  -