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\bibitem{WiltonAgila_etal2018} Wilton Agila, Gomer Rubio, L. Miranda, \& L. V{\'a}zquez. (2018). Qualitative Model of Control in the Pressure Stabilization of PEM Fuel Cell. In \textit{7th International Conference on Renewable Energy Research and Applications, ICRERA 2018. Paris, Francia.} (pp. 1221--1226).

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