1. The use of protozoa to indicate changes in the performance of activated sludge plants;Al-Shahwani;Wat. Res.,1991
2. Valutazione di parametri biologici come indici di efficienza di depurazione in impianti a fanghi attivi;Antonietti;Ingegn. Ambientale,1982
3. Die Zahlung von Protozoen und kleinen Metazoen im Belebtschlamm;Augustin;Acta hydrochim. hydrobiol.,1989
4. Microfauna of an activated sludge pilot plant treating effluents from a pharmaceutic industry;Becares,1991
5. Evaluation of the abundance ratio between crawling and attached ciliates in the management of an activated sludge sewage-treatment plant;Bedogni,1991