Trujillo, A., and L. Herrera. “Developing a Dissolved-Air Pilot Flotation Unit. Evaluation of the Design Parameters”. Rev. Téc. Fac. Ing. Univ. Zulia, Vol. 18, no. 3, 1, http://www.produccioncientifica.luz.edu.ve/index.php/tecnica/article/view/5487.