TY  - BOOK
AU  - Hilburn, J.L. Johnson, D.E.
TI  - Rapid practical designs of active filters
SN  - 0471443042
U1  - 621.381532 
PY  - 1975///
CY  - New York
PB  - John Wiley & Sons
KW  - Filters
KW  - Electric filters-designs
ER  -