1. Obtaining accurate measurements of directional hearing aid parameters.;Preves;Hear J,1975
2. Directional microphone hearing aids: A 10-year report.;Mueller;Hear Instr,1981
3. A proposed standard method of measuring the directivity factor Q of loudspeakers used in commercial sound work.;Davis;J Audio Eng Soc,1973
4. On standardizing the measurement of Q.;Davis;J Audio Eng Soc,1973
5. Further comments on directivity factor.;Davis;J Audio Eng Soc,1973