TY  - BOOK
AU  - Helfrick, Albert, D Cooper, William, D 
TI  - Modern electronic instrumentation and measurement techniques 
SN  - 81-203-0752-6 
U1  - 621.37 HEL  
PY  - 2003///
CY  - Prentice hall of india 
PB  - New Delhi 
KW  - INSTRUMENT AND MEASURMENTATION
ER  -