1. Morse, P. M., Feshbach, H.,Methods of Theoretical Physics, MacGraw-Hill, New-York (1953).
2. Ribaut, M.,Three-dimensional Calculation of Flow in Turbomachines with the Aid of Singularities, J. Eng. for Power90, nr. 3 (1968).
3. Marchuk, G. I.,Methods of Numerical Mathematics, Springer Verlag, Berlin (1975).
4. Jacobs, D. A. H.,The State of the Art in Numerical Analysis, Academic Press, New York (1977).
5. Ribaut, M., Vainio, R.,On the Calculation of Two-dimensional Subsonic and Shock-free Transonic Flow, J. Eng. for Power97, nr. 4 (1975).