TY  - BOOK
AU  - Huelsman,L.P.
TI  - Active RC filters: theory and applications 
SN  - 0879332417
PY  - 1976///
CY  - Hutchinson & Ross, Stroudsburg, Pa.
PB  - Dowden
KW  - Electric filters, Active
N1  - Includes bibliographical references and indexes
ER  -