1. et al., “Wastewater Characteristics and Treatment Technology for Liquefaction of Coal Using the H-Coal Process.” Proc. 32nd Ind. Waste Conf., Purdue Univ., Ext. Ser. (1977).
2. et al., “Treatment and Control Technology for Coke Plant Wastewaters.” 84th Nat. Meeting, Amer. Inst. Chem. Eng., Atlanta, Ga. (1978).
3. “Development Document for Effluent Limitation Guidelines and New Source Performance Standards for the Steel Making Segment of the Iron and Steel Manufacturing Point Source Category”, EPA-440/1-74-024a, U. S. Environmental Protection Agency, Wash., D.C. (1974).
4. et al., “Applicability of Coke Plant Control Technologies to Coal Conversion”, EPA-600/7-79-184, U. S. Environmental Protection Agency, Wash., D.C. (1979).
5. et al., “Applicability of Petroleum Refinery Control techniques to Coal Conversion”, PB-288–630, U. S. Environmental Protection Agency, Wash., D. C. (1978).