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Guti\'e9rrez-Naranjo, M. A., P\'e9rez-Jim\'e9nez M. J., Riscos-N\'fa\'f1ez A., Romero-Campero F. J., & Romero-Jim\'e9nez \'c1.  (2006).??Characterizing Tractability by Cell-Like Membrane Systems.  (K. G. Subramanian, K. Rangarajan, M. Mukund, Ed.).\ul Formal models, languages and applications. 66,\ul0  137-154.\par \par }