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      Membrane division, restricted membrane creation and object complexity in P systems  [Article]

      Alhazov, Artiom; Freund, Rudolf; Riscos Núñez, Agustín (Taylor and Francis, 2006)
      We improve, by using register machines, some existing universality results for specific models of P systems. P systems with membrane creation are known to generate all recursively enumerable sets of vectors of non-negative ...