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Gerrey, W. ., Brabyn, J. ., Fowle, T. ., & Alden, A. . (1992). The Smith-Kettlewell auditory breakout box. Conference: Computing Applications to Assist Persons With Disabilities, 1992., Proceedings of the Johns Hopkins National Search, 173-176. 10.1109/CAAPWD.1992.217376 (Original work published 1992)

Brabyn, J. ., Gerrey, W. ., Fowle, T. ., Alden, A. ., & Williams, J. . (1989). Some practical vocational aids for the blind. Conference: Engineering in Medicine and Biology Society, 1989. Images of the Twenty-First Century., Proceedings of the Annual International Conference of the IEEE Engineering in Conference, 5, 1502-1503. 10.1109/IEMBS.1989.96310 (Original work published 1989)