1. P. Dal Pozzo, R. Polloni, O. Svelto: Appl. Phys.6 (1975)
2. F.E. Cartson, C.N. Clark: In:Applied Optics and Optical Engineering, ed. by R. Kingslake (Academic Press, New York 1965) Vol. 1, p. 52
3. It must be noted that this spectrum is not particularly accurate, since the width of the spectral lines is comparable to the resolving power of our monochromator
4. PEK Technical Bulletin CAP-11-A66
5. P.W.J.M. Boumans:Analytical Spectroscopy, Vol 1, part II (Marcel Dekker Inc. New York 1972) pp. 168–180