TY  - BOOK
AU  - Hilburn John L
AU  -  Johnson david E
TI  - Manual of active filter design
U1  - D85526:4g, L3 
PY  - 1973///
CY  - New York 
PB  - McGraw-Hill      
KW  - Fiter design
N1  - Bibliography185-186p
ER  -