1. I. K. Argyros, On the approximate solutions of nonlinear functional equations under muld differentiability conditions,Acta Math. Hungar.,58 (1991).
2. M. Balazs and G. Goldner, On the method of the cord and on a modification of it for the solution of nonlinear operator equations,Stud. Cerc. Mat.,20 (1968), 981–990.
3. M. Balazs and G. Goldner, On an iterative method with difference quotients of the second order,Studia Sci. Math. Hungar.,4 (1969), 249–255.
4. J. E. Dennis, Toward a unified convergence theory for Newton-like methods. In:Nonlinear Functional Analysis and Applications, Ed. I. B. Rall, Academic Press (New York, 1971), pp. 425–472.
5. Bela Janko,The Solution of Nonlinear Operator Equations in Banach Spaces, Editura Academiei Republici Socialiste Romania (Bucharest, 1969).