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\bibitem{RicardoCajo+WiltonAgila2015} Ricardo Cajo, \& Wilton Agila. (2015). Evaluation of algorithms for linear and nonlinear PID control for Twin Rotor MIMO System. In \textit{Computer Aided System Engineering (APCASE), 2015 Asia-Pacific Conference on, Quito, 2015} (pp. 214--219). IEEE.

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