1. Baudrand,J., Chevillot,A., Dupin,J.P., Guerin,J., Bellenger,R., Felenbok,P., Picat,J.P., Vanderriest,C.: 1982, J. Optics, 13, 295
2. Bely, P.Y., Leliévre, G.: 1982 in Instrumentation for astronomy with large optical telescopes D. Reidel, Ed. Colin M. Humphries, p. 21
3. Blecha,A.: 1984, Astron. Astrophys. 135, 401.
4. Boroson,T.A., Thompson,I.B., Schectman,S.A., 1983, Astrophys. J. 88, 1707
5. Carruthers,G.R.: 1979 in Advances in electronics and electron physics, Academic Press, p. 283