1. and Proceedings of the Twenty-Second Purdue Industrial Waste Conference, Lafayette, Indiana, 559 (Ann Arbor Science, Ann Arbor, Michigan, 1967).
2. Use of the upflow sludge blanket (USB) reactor concept for biological wastewater treatment, especially for anaerobic treatment
3. and Proceedings of the Thirty-Sixth Purdue Industrial Waste Conference, Lafayette, Indiana, 686 (1981).
4. and 3rd International Symposium on Anaerobic Digestion, Boston, Massachusetts, August 14-19 (1983).