1. Standard Methods for the Examination of Water and Wastewater;APHA,1980
2. Biological denitrification of sewage: a literature review;Christensen;Prog. Wat. Technol.,1977
3. Effect of fill:react ratio on sequencing batch biological reactors;Dennis;J. Wat. Pollut. Control Fed.,1979
4. Intermittent operation of the extended aeration process for small systems;Goronszy;J. Wat. Pollut. Control. Fed.,1979
5. Sequentially operated biological systems for bulking sludge control;Goronszy,1980