1. Ben Israel, A., Greville, T.N.E.: Generalized Inverses: Theory and Applications. New York London Sydney Toronto: Wiley 1974
2. Berman, A., Plemmons, R.J.: Nonnegative Matrices in the Mathematical Sciences. New York London: Academic Press 1979
3. Campbell, S.L., Meyer, C.D. Jr.: Generalized Inverses of Linear Transformations. London San Francisco Melbourne: Pitman 1979
4. Eiermann, M., Niethammer, W.: On the construction of semiiterative methods. SIAM J. Numer. Anal.20, 1153?1160 (1983)
5. Eiermann, M., Niethammer, W., Varga, R.S.: A study of semiiterative methods for nonsymmetric systems of linear equations. Numer. Math.47, 505?533 (1985)