Finol, D., and N. Queipo. “Adaptive Ensemble of Metamodels for the Solution of Modelling and Global Optimization Problems”. Rev. Téc. Fac. Ing. Univ. Zulia, Vol. 35, no. 1, June 2012, http://www.produccioncientifica.luz.edu.ve/index.php/tecnica/article/view/6819.