1. Augmented pigmentation and other responses of normal human skin to solar radiation following oral administration of 8-methoxypsoralen;Fitzpatrick;J. Invest. Dermat,1955
2. Daniels, F., Jr., Hopkins, C. E., Imbrie, J. D., Bergeron, L., Miller, O., Crowe, F. and Fitzpatrick, T. B.: Field trials of the Suntan Promoting Effects of Methoxsalen. This Symposium, p. 321.
3. Compari-son between visual grading and reflectance measurements of erythema produced by sunlight;Daniels;J. Invest. Dermat,1958
4. Ultraviolet Radiation;Koler,1952
5. Mathematics, measurement and psychophysics;Stevens,1951