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- [39] Special fluid pumps ... Properly named - Danger prevented. New standard defines the concepts for pumps and pumping plants Chemie-Technik (Heidelberg), 1999, 28 (12): : 52 - 54
- [40] Special fluid pumps ... Eyes open on sound. New standard standardizes noise measurement at pumps and pump aggregates Chemie-Technik (Heidelberg), 1999, 28 (12): : 60 - 61