1. Bjorn, V., and R. Schilling. 2004. “U.S. Navy Flight Deck Hearing Protection Use Trends: Survey Results. Presentation at the HFM Symposium on New Direction for Improving Audio Effectiveness, Neuilly-sur-Seine, France: NATO Research and Technology Organization.
2. Casali, J. G., and K. Lee. 2016. Foam vs. Deep Custom-molded Earplugs: A Comparison of Attenuation Achieved with Inexperienced-subject-fit and Trained-subject-fit, Retention of Training Benefit After Extended use. Spectrum, Vol. 34, Supplement 1, and Presentation at the 42nd Annual National Hearing Conservation Association Conference, San Antonio, TX, February 23–25, 2017. (Also appears as: Objective comparison of foam vs. deep custom-molded earplugs, protective effectiveness and user preference, inclusive of user training implications. Contract #N000014-15-1-2569, Office of Naval Research, Code 34, Final Report: Audio Lab 10/25/16-1-HP, October 2016).
3. The Department of Defense Epidemiologic and Economic Burden of Hearing Loss Study
4. Fischer, R., L. Boroditsky, and J. Spence. 2004. “SBIR 98-092, Phase II Shipboard Airborne Noise Control Design and Diagnostic Tool,” Report 04-001, March. Billerica, MA: Noise Control Engineering Inc.