1. Ekman, G. Subjective power functions and the method of Fractionation. Technical Report No. 34, University of Stockholm, 1956.
2. Ekman, G., & Frankenhaeuser, M. Subjective time scales. Technical Report No. 49, University of Slockholm, 1957.
3. Kaner, C., & Allan, L. G. Unpublished data. These data are available from L.G. Allan upon request.
4. Kristofferson, A. B. Psychological timing mechanisms. Paper presented at the Fourth Annual Meeting of the Lake Ontario Vision Establishment, Niagara Falls, Ontario, 1973.
5. Hopkins, G. Unpublished dzta.