TY  - RPRT
TI  - Electronic filters, signal conversion apparatus, hearing aids and methods
AU  - Morley, Jr., Robert E.
AU  - Engebretson, A. Maynard
AU  - Engel, George L.
AU  - Sullivan, Thomas J.
PY  - 1994
UR  - https://ntrs.nasa.gov/citations/20080004803
ID  - 20080004803
ER  -