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Federation, W., E. (2006). Biological nutrient removal [BNR] operation in wastewater treatment plants . new york: Akademi Komunitas Perkebunan Yogyakarta.

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Federation, W., E.. Biological nutrient removal [BNR] operation in wastewater treatment plants. new york: Akademi Komunitas Perkebunan Yogyakarta, 2006. Text.