1. Cf. for instance, J. Weissinger, Ueber das Iterationverfahren, ZAMM 31 (1951), p. 245.
2. Cf. for instance, A.M. Ostrowski, Ueber Normen von Matrizen, Math. Z. 63 (1955), p. 5, formula (11).
3. P. Henrici, Bounds for iterates, inverses, spectral variation and fields of values of non-normal matrices, Numer. Math. 4 (1962), p. 30, theorem 3.
4. l.c.p. 27, formula (1.6)
5. Cf. A.M. Ostrowski, Solution of Equations and Systems of Equations, 2d. edition (1966), p. 204.