1. Secr. Rep. “Colorimetry and artificial daylight,” in Proc. 12th Session C.I.E., Stockholm, Vol. 1, Techn. Committee No. 7, Bureau Central de la CIE, Paris, p. 11 (1951).
2. The colour of light of very long wavelength
3. and , Color Wiley, Wiley, New York, 1967.
4. 18th Thomas Young Oration, “The basic data of colour-matching,” Phys. Soc. Year Book, p. 44 (1955).
5. Vision in the ultraviolet, thesis, Utrecht, 1971.