Reference

C. Tellez, Genoveva F. Esteban (1991): The density of ciliate populations in the prediction of the activated-sludge performance. In Madoni P. (ed) Biological approach to sewage treatment process: current status and perspectives – Proc. Int. Symp. Perugia 15-17 October, 1990 – 1990: 49 - 52.