Kanaya, S. and E. Kichize, 1977 : Color temperature and color rendering of light sources for interior lighting - Effect on preferred illuminance. National Tech. Report, 23 (4) : 584- 594. (in Japanese with English abstract)
Kruithof, A. A., 1941 : Tubular luminescence lamps for general illumination. Phillips Tech. Rev., 6: 65-73
Wake, T., T. Kikuchi, K. Kakeichi, M., Kasama and H. Kamisasa, 1977: The effects of illuminance, color temperature and color rendering index of light sources upon comfortable visual environments -in the case of office-. J. Light & Visual Environments, 1 (1) : 31- 39.
Weston, H. C., 1953: Visual fatigue with special reference to lighting. Trans. Illum. Eng. Soc., 18 (2) : 39- 67.