References
- NgaiP. Y. “On task contrast and visibility”, Journal of the Illuminating Engineering Society, Vol. 6, No. 1, October 1976, p. 52.
- BlackwellH. R. “Development of procedures and instruments for visual task evaluation”, Illuminating Engineering, Vol. 65, No. 4, April 1970, p. 267.
- “A unified framework of methods for evaluating visual performance aspects of lighting”, CIE Report No. 19, Commission Internationale de l'Eclairage, Paris, 1972.
- BlackwellH. R. “The prescription of interior lighting—a progress report”, Lighting Design And Application, Vol. 4, No. 1, January 1974, p. 12.
- BlackwellO. M. and BlackwellH. R. “Visual performance data for 156 normal observers of various ages”, Journal of the Illuminating Engineering Society, Vol. 1, No. 1, October 1971, p. 3.