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2. R. L. Antonie, Three-Step Biological Treatment with the Bio-Disc Process. technical paper presented at the New York Water Pollution Control Association Annual Meeting. Milwaukee, Wisconsin. June 14–16 (1972).
3. R. L. Antonie, Three-Step Biological Treatment with the Bio-Disc Process, technical paper presented at the New York Water Pollution Control Association, Montauk, New York, June 12–14 (1972).
4. Metcalf and Eddy, Inc. Wastewater Engineering Treatment and Reuse, 4th Edition, McGraw Hill, New York (2003).
5. US EPA, Innovative and Alternative Technology Assessment Manual. US Environmental Protection Agency Washington DC (1978).