Ferrara de Giner, G., & Rodríguez Mora, F. (1). Biological nitrogen removal using combinated fixed-film and suspended reactors by intermittent operation. Rev. Téc. Fac. Ing. Univ. Zulia, 32(3). Retrieved from http://www.produccioncientificaluz.org/index.php/tecnica/article/view/6679