1. The scotopic visibility function;Crawford,1949
2. Human visual purple;Crescitelli;Nature, Lond.,1953
3. Fulton, Anne B. andRushton, W. A. H. (1971). (In press).
4. The photosensitivity of visual purple solutions and the scotopic sensitivity of the eye in the ultraviolet;Goodeve,1941
5. Hood, C. andRushton, W. A. H. (1971). (In press).