International Commission on Illumination, “A unified framework of methods for evaluating visual performance aspects of lighting,” Publ. CIE No.19, (E-l.4.2), 1972, Part I. pp. 1–11.
2.
BlackwellH. R., “Specification of interior illumination levels,” Ilium. Eng., vol. 54, no. 6, p. 317, 1959.