1. S.Y. Ch'en, M.Takeo: Rev. Mod. Phys. 29, 20 (1957)
2. R. G. Breen, Jr.: The Shift and Shape of Spectral Lines (Pergamon Press, Oxford 1961); in Handbuch der Physik, XXVII, ed. by S. Flügge (Springer, Berlin, Heidelberg, New York 1964) pp. 1–79
3. W.R.Hindmarsh, J.M.Farr: Collision Broadening of Spectral Lines by Neutral Atoms, in Progress in Quantum Electronics, vol. 2, part 4, ed. by J. H. Sanders, S. Stenholm (Pergamon Press, Oxford 1973)
4. P. R. Berman: Appl. Phys. 6,283 (1975)
5. B. D. Fried, S. D. Conte: The Plasma Dispersion Function (Academic Press, New York 1961)