1. Danilevski, A.: On a numerical solution of Vekua’s equation. Mat. Sb. 2 (Russian) (1937) 169–171.
2. Gantmacher, F.R.: Theory of Matrices I. Chelsea Publishing Company. New York (1977).
3. Monagan M.B. et al: MAPLE V. programming Guide. Springer. New York (1996).
4. Mulders T.M.L., Levelt, A.H.M.: A package for the computation of several matrix normal forms. Share Library. MAPLE V (1993).
5. Olazábal, J.M.: Procedimientos simbólicos en Álgebra Lineal. Servicio de Publicaciones de la Universidad de Cantabria. Santander. SPAIN (1998).