1. Metrologia19, 163 (1984) (recommended radiations at 612 nm, 633 nm, and 514 nm wavelength)
2. K.G. Zhao, J. Blaba, J. Helmcke: IEEE Trans. IM-34, 252 (1985)
3. J.-M. Chartier, J.L. Hall, M. Gläser: Proc. CPEM '86, ISBN 86 CH2267-3, 323 (1986)
4. R. Balhorn, H. Kunzmann, F. Lebowsky: Appl. Opt.11, 742 (1972)
5. Lasers ?A? and ?B?: Model LHGR 050 of PMS. He?Ne lasers emitting at 543.5 nm are also available by Melles Griot (model 05 SGR 51) and Siemens (model LGK 7770)