References
- McNelisJ. F., and GuthS. K. “Visual performance—further data on complex test object”, Illuminating Engineering, Vol. 64, No. 2, February 1969, p. 99.
- McNelisJ. F. “Human performance—A pilot study”, Journal of the Illuminating Engineering Society, Vol. 2, No. 3, April 1973, p. 190.