Burguete, José F., and Esteban Burguete. “Characterization of K-Class Estimation in Simultaneous Equation Models”. The Journal of Agriculture of the University of Puerto Rico 74, no. 3 (July 1, 1990): 307–310. Accessed April 26, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/6664.