TY  - RPRT
TI  - An active noise reduction system for aircrew helmets
AU  - Wheeler, P. D.
AU  - Rawlinson, D.
AU  - Pelc, S. F.
AU  - Dorey, T. P.
PY  - 1978
UR  - https://ntrs.nasa.gov/citations/19790002682
ID  - 19790002682
ER  -