Romero Silva, Rafael. “Non-Linear Regressio Analysis for Unconstrained Optimization Using Numerical Differentiation”. Rev. Téc. Fac. Ing. Univ. Zulia 5, no. 1 (1). Accessed August 3, 2025. http://www.produccioncientifica.luz.edu.ve/index.php/tecnica/article/view/4156.