1. Blauert, J. (1969). Sound localization in the median plane.Acoustica,22, 205–213.
2. Bloom, P. J. (1977). Creating source elevation illusions by spectral manipulation.Journal of the Audio Engineering Society,25, 560–565.
3. Butler, R. A. (1970). The effect of hearing impairment on locating sound in the vertical plane.International Audiology,9, 117–126.
4. Butler, R. A. (1997). Spatial referents of stimulus frequencies: Their role in sound localization. In R. Gilkey & T. R. Anderson (Eds.),Binaural and spatial hearing (pp. 99–115). Hillsdale, NJ: Erlbaum.
5. Butler, R. A., &Belendiuk, K. (1977). Spectral cues utilized in the localization of sound in the median sagittal plane.Journal of the Acoustical Society of America,61, 1264–1269.