Villegas Gómez, J. D., J. Guerrero Erazo, J. M. Castaño Rojas, y D. Paredes Cuervo. «Septic Tank (ST)-Up Flow Anaerobic Filter (UFAF)-Subsurface Flow Constructed Wetland (SSF-CW) Systems Aimed at Wastewater Treatment in Small Localities in Colombia». Rev. Téc. Fac. Ing. Univ. Zulia, Vol. 29, n.º 3, noviembre de 2010, https://mail.produccioncientificaluz.org/index.php/tecnica/article/view/6031.