TY  - BOOK
AU  - Haokip, Mangtinlal  .
TI  - Class of service management in telephone exchange (BSNL, Imphal, Manipur) / 
U1  - BV 
PY  - 2011///
CY  - Imphal : 
PB  - Manipur University , 
KW  - Computer- Telephone exchange, Service management
ER  -