TY  - BOOK
AU  - Johnson, David E.
TI  - Rapid practical designs of active filters
SN  - 0-471-44304-2
U1  - RR D65e:4 L5;1 
PY  - 1975///
CY  - New York
PB  - John Wiley
N1  - Includes Appendis, References and Index
ER  -