Individual Differences, Cognitive Abilities, and the Interpretation of Auditory Graphs. - Bruce N. Walker; Jeff Lindsay; Justin Godfrey (ICAD, 2004)

The Audio Abacus: Representing a Wide Range of Values with Accuracy and Precision. - Bruce N. Walker; Lisa M. Mauney; Justin Godfrey (ICAD, 2004)

The audio abacus: representing numerical values with nonspeech sound for the visually impaired. - Bruce N. Walker; Jeffrey Lindsay; Justin Godfrey (ACM SIGACCESS Access. Comput., 2004)