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by Soemarto, S; Sukarmadidjaja, H; Soedomo, M. -- International Association on Water Quality -- IAWQ Asian Regional Conference on Water Conservation and Pollution Control (4th : 1993 : Jakarta, Indonesia).
by Warren, Charles E; Doudoroff, Peter.
by Stuthridge, Trevor R. (Trevor Raymond). -- (3rd : International Conference on Environmental Fate and Effects of Pulp and Paper Mill Effluents 1997 : Rotorua, N.Z.).
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