Aldana, Gerardo, y Jhonny Pérez. 2010. «Mean Hydraulic Retention Time and Pathways Flow Simulation through Out a Physical Model for a WSPs and an UASB». Rev. Téc. Fac. Ing. Univ. Zulia 33 (1). http://www.produccioncientifica.luz.edu.ve/index.php/tecnica/article/view/7170.