TY  - RPRT
TI  - Electronic filters, hearing aids and methods
AU  - Engebretson, A. Maynard
AU  - O'Connell, Michael P.
AU  - Zheng, Baohua
PY  - 1991
UR  - https://ntrs.nasa.gov/citations/20080004409
ID  - 20080004409
ER  -