(3) Carter, D. J., et. al.: Design calculations for electric lighting in real interirors, J. Illum. Engng., pp. 79-89 (1997).
(4) Newsham, G. R. and Sander, D. M.: The effect of office design on workstation lighting: A simulation study, J. Illum. Engng., pp. 52-73 (2003).
(5) Ohtani, Y., et. al.: On the shadow characteristics in a rectangular parallelpiped model room, J. IEIE Jpn. (in Japanese), 17-8, pp. 799-808 (1997).