1. The occurrence of microorganisms in water main encrustations;Allen;J. Am. Wat. Wks Ass.,1980
2. Standard Methods for the Examination of Water and Wastewater;APHA,1985
3. Microbial fouling;Characklis,1990
4. Biofilm processes;Characklis,1990
5. Selected drinking water characteristics and attached microbial population density;Donlan;J. Am. Wat. Wks Ass.,1988