1. J. M. Campbell, Gas Conditioning and Processing, Volumes 1 and 2. Campbell Petroleum Series (1976).
2. J.H. Ferziger and H.G. Kaper, Mathematical Theory of Transport Processes in Gases (NH, 1972).
3. W. Glaser, Grundlagen der Elektronenoptik, Springer, Wien (1952).
4. L.D. Landau & E.M. Lifshitz, Quantum Mechanics, Non-Relativistic Theory (Volume 3 of A Course of Theoretical Physics), Pergamon Press (1965).
5. H. Bateman and A. Erdélyi (Eds.) Higher Transcendental Functions. The Hypergeometrical Function. Legendre functions, McGraw-Hill (1953).