1. DIN 5031-2:1982-03, Optical radiation physics and illuminating engineering; evaluation of radiation by different detectors
2. DIN 5031-3:1982-03, Optical radiation physics and illuminating engineering; quantities, symbols and units of illuminating engineering
3. Wikipedia,
http://en.wikipedia.org/wiki/File:Luminosity.png
. Accessed 11 Feb 2015
4. ISO 16505:2015, Sec. 7.8.2 Luminance and contrast rendering, Test 3: Night condition
5. Kuwabara, G.: On the flare of lenses. J. Opt. Soc. Am. 43(1), 53–57 (1953)