TY  - BOOK
AU  - Middlehurst, Jack 
AU  - Harrison, Roger
TI  - Practical filter design 
SN  - 0137199805 
U1  - 621.3815324 MID 1993 
PY  - 1993///
CY  - New York
PB  - Prentice Hall
KW  - x Electronic filter
KW  - Design
N1  - Includes bibliographical reference and index
ER  -