Gonzalez, E.A., Tepljakov, A., Monjec, C.A. and Petráš, I. 2017. Retrofitting fractional-order dynamics to an existing feedback control system: from classical proportional-integral (PI) control to fractional-order proportional-derivative (FOPD) control . International Research Journal on Innovations in Engineering, Science and Technology. 3, (Dec. 2017), 32–36.