1. Some factors affecting the viability of faecal bacteria in water;Allen;J. gen. Microbiol.,1952
2. A User's Guide to SAS '76;Barr,1976
3. Über die Wirksamkeit von Abwasserbentonit zur Klarung von Papierfabriksabwassern;Brecht;Das Papier,1974
4. Operation and control of water treatment processes;Cox,1964
5. Regrowth of faecal coliforms;Deaner;J. Am. Wat. Wks Ass.,1969