References
- SimonE., “Semiautomated photometric test equipment”, Report No. 680495, Society of Automotive Engineers, May 20-24, 1968.
- SoundersM., The Engineer's Companion, New York: John Wiley and Sons, Inc., 1966, pp. 401, 402, 409.
- Commercial Specifications for a “Digital-Luxmeter FLMX 007”, Berlin, Germany: Optronik GMBH, 1973.