Argyros, I. K. (1996). An error analysis for the Steffensen method under generalized Zabrejko-Ngyen-type assumptions. Rev. Anal. Numér. Théor. Approx., 25(1), 11–22. Retrieved from https://ictp.acad.ro/jnaat/journal/article/view/1996-vol25-nos1-2-art2