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3. ABB Control Technologies: Funtional Description, PP_ FunctionLib. Västeras, Sweden (2012). Document number: 3BTG811792-3011, Version 5.2-0
4. ABB Control Technologies: Functional Description: PID01A—Closed Loop Controller with Auto Tuner, Version 5.2-0 . Västeras, Sweden (2012). Document number: 3BTG811792-3033
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