Păvăloiu, Ion. “Observations Concerning Some Approximation Methods for the Solutions of Operator Equations”. Rev. Anal. Numér. Théor. Approx. 23, no. 2 (August 1, 1994): 185–195. Accessed June 14, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1994-vol23-no2-art8.