Ferrara de Giner, G. and 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). Available at: http://www.produccioncientifica.luz.edu.ve/index.php/tecnica/article/view/6679 (Accessed: 26September2025).