TY  - BOOK
AU  - Gnanashivam, P 
TI  - Telecommunication switching systems and networks 
SN  - 81-224-1583-0 
U1  - 621.382 2 GNA  
PY  - 2005///
CY  - New age international private, Ltd. 
PB  - New Delhi 
KW  - TELECOMMUNICATION
ER  -