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International Symposium on Viruses and Wastewater Treatment (1980 : University of Surrey)
ScienceDirect https://www.sciencedirect.com/science/book/9780080264011
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International Colloquium on Energetics and Technology of Biological Elimination of Wastes (1979 : Rome, Italy)
ScienceDirect http://www.sciencedirect.com/science/book/9780444419002
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