Păvăloiu, Ion. “Error Estimation in Numerical Solution of Equations and Systems of Equations”. Rev. Anal. Numér. Théor. Approx. 21, no. 2 (August 1, 1992): 153–165. Accessed April 15, 2025. https://ictp.acad.ro/jnaat/journal/article/view/1992-vol21-no2-art8.