1. R.G. Breene, Jr.:The Shift and Shape of Spectral Lines (Pergamon Press, Inc. New York 1961)
2. M. Baranger: InAtomic and Molecular Processes, ed. by D. R. Bates (Academic Press, New York 1962) Chapter 13
3. H.R. Griem: InPlasma Spectroscopy (McGraw Hill Book Co., New York 1964) Chapter 4
4. J.T. Jeffries:Spectral Line Formation (Blaisdell Pub. Co., Waltham, Mass 1968)
5. I.I. Sobelman:Introduction to the Theory of Atomic Spectra (Pergamon Press, New York 1972)