1. M. Abramowitz and I. A. Stegun, Handbook of Mathematical Functions, Dover, New York, (1965); Tenth Edition (1972).
2. I. Alexeff, Private Communication. (1963).
3. J. M. Buzzi, Etude théorique et expérimentale des perturbations électrostatiques en plasma chaud unidimensionnel, Thèse de Doctorat d’Etat, Université Paris-Sud, Orsay (1974).
4. H. Derfler, in Proceedings of the Seventh International Conference on Phenomena in Ionized Gases, Vol. 2, p. 282, (D. Perovich and D. Toshich, eds.), Gradevinska Knjiga, Beograd, Yugoslavia (1966).
5. H. Derfler and T. C. Simonen, Landau waves: an experimental fact, Phys. Rev. Lett.
17, 172–175 (1966).