Literature Cited
- American Society of Brewing Chemists. Report of Subcommittee on Instrumentation. Proc. 1968, p. 257.
- National Bureau of Standards. Letter Circular LC-1017.
- Beckman Instruments, Inc., Fullerton, California. Regional Newsletter, September 17, 1968.
- Applied Optics. Vol. 1, No. 3, May 1962 pp. 365–376.