TY  - BOOK
AU  - Valkenburg, Van, M. E. 
TI  - Network analysis 
SN  - 81-203-0156-0 
U1  - 621.385 1 VAL  
PY  - 1999///
CY  - Prentice hall of india 
PB  - New Delhi 
KW  - NETWORK ANALYSIS
ER  -