1. Nitrogen relationships in biological treatment processes—I. Nitrification in the activated sludge process
2. Biological Denitrification;BARNARD;Water Poll. Control,1973
3. BARTH E.F. et al (1967) “Managing Continuous Flow Biological Denitrification”, Proc. 7th Ind. Water & Waste Conf., University of Texas.
4. Removal of nitrogen by municipal water treatment plants;BARTH;J.W.P.C.F.,1966
5. BESIK F. (1975) “A New Treatment for Renovation of Domestic Wastewaters”. (To be published.)