1. D. L. DiLaura, “On the computation of equivalent sphere illumination,” Journal of the Illuminating Engineering Society, Vol. 4, No. 2, January 1975, p. 129.
2. R. E. Levin, “Position index in VCP calculations,” Journal of the Illuminating Engineering Society, Vol. 4, No. 2, January 1975, p. 99.
3. Committee on Recommendation of Quantity and Quality of Illumination of the IES, “Outline of a standard procedure for computing visual comfort ratings for interior lighting,” RQQ Report No. 2 (1972), Journal of the Illuminating Engineering Society, Vol. 2, No. 3, April 1973, p. 328.
4. The Fortran-IV computer program for general contour plotting, using a line-printer or similar computer peripheral device, is available from the author upon request: Smith, Hinchman & Gryllis Associates, Inc., 455 W. Fort Street, Detroit, Michigan 48226.