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- [29] Minimizing of the pollutant load on the River Ruhr GWF, das Gas- und Wasserfach: Wasser/Abwasser, 1988, 129 (04): : 256 - 261
- [30] SAMPLING STRATEGY FOR RIVER POLLUTANT TRANSPORT JOURNAL OF ENVIRONMENTAL ENGINEERING-ASCE, 1983, 109 (01): : 219 - 231