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    • PI-controlled bioreactor as a generalized Liénard system 

      Ibarra Junquera, Vrani; Rosu Barbus, Haret-Codratian (Elsevier, 2007)
      "It is shown that periodic orbits can emerge in Cholette’s bioreactor model working under the influence of a PI-controller. We find a diffeomorphic coordinate trans-formation that turns this controlled enzymatic reaction ...