@book{Monje2010, title={Fractional-order systems and controls: fundamentals and applications}, author={Monje, Concepci{\'o}n A and Chen, YangQuan and Vinagre, Blas M and Xue, Dingyu and Feliu-Batlle, Vicente}, year={2010}, publisher={Springer Science \& Business Media} } @article{Valério2006, title={Tuning of fractional PID controllers with Ziegler--Nichols-type rules}, author={Val{\'e}rio, Duarte and da Costa, Jos{\'e} S{\'a}}, journal={Signal Processing}, volume={86}, number={10}, pages={2771--2784}, year={2006}, publisher={Elsevier} } @article{Barbosa2010, title={Effect of fractional orders in the velocity control of a servo system}, author={Barbosa, Ramiro S and Machado, JA Tenreiro and Jesus, Isabel S}, journal={Computers \& Mathematics with Applications}, volume={59}, number={5}, pages={1679--1686}, year={2010}, publisher={Elsevier} }