1. “Rotating Disks with Biological Growths Prepare Wastewater for Disposal or Reuse”;TORPEY;Jour. Water Pollution Control Federation,1971
2. “Nitrification”;JENKINS;Jour. Inst, of Water Pollution Control,1969
3. Investigation of the use of high purity oxygen aeration in the conventional activated Sludge process;ALBERTSSON,1970
4. ANTONIE, R.L. and WELCH, F.M. (1969). Preliminary results of Novel Biological Process for Treating Dairy Wastes. Proc. of the 24th Ind. Waste Conf., Part I. Purdue University.
5. Biological Waste Treatment Using Rotating Discs;BORCHARDT,1971