León, O., C. Cárdenas, and J. Carruyo. “Design and Construction of a Rapid Filter of Multiple Bed to Pilot Scale”. Rev. Téc. Fac. Ing. Univ. Zulia, Vol. 27, no. 1, 1, https://mail.produccioncientificaluz.org/index.php/tecnica/article/view/5831.