1. Ortega, J.M., Rheinboldt, W.C.: Iterative solution of nonlinear equations in several variables. New York-London: Academic Press, 1970
2. Ostrowski, A.M.: Solution of equations in Euclidean and Banach spaces. New York-London: Academic Press, 1973
3. Traub, J.F.: Iterative methods for the solution of equations. Englewood Cliffs: Prentice Hall, 1964