1. Brauer, H.; Hennig, R.: Aerobic two-stage biological degradation of organic carbon compounds and ammonium. Bioprocess Eng. 1 (1986) 13?22
2. Mudrak, K.; Kunst, S.: Biologie der Abwasserreinigung. Stuttgart: Gustav Fischer 1985
3. De Renzo, D. J.: Nitrogen control and phosphorus removal in sewage treatment. New York: Noyes Data Corporation, Park Ridge 1978
4. Deqyansky, M. T.; Sherrard, I: Effect of nitrification in the activated sludge process. Water & Sewage Work, June (1977) 94?97
5. Sekoulov, J.; Heinrich, D.: Pilotversuche zur Nitrifikation im Festbettreaktor. Wasserwirtschaft 71 (1981) 331?333