Tham khảo Điểm_đặt_(lý_thuyết_điều_khiển)

  1. An 'essential variable' is defined as "a variable that has to be kept within assigned limits to achieve a particular goal": Jan Achterbergh, Dirk Vriens (2010). "§2.3 Cybernetics: Effective methods for the control of complex systems".
  2. B. Wayne Bequette (2003).
  3. W. Ross Ashby (1957).
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