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Tsuneo HIRAOKA. "第5次総量規制対応の水質自動計測器の現状と開発動向 NP600とNP1000形の全窒素・全りん自動測定装置 排水モニタリングから排水処理設備のフィードバック・制御まで." Journal of Environmental Conservation Engineering 31.3 (2002) 201-204