- Design of retuning fractional PID controllers for a closed-loop magnetic levitation control systemTepljakov, Aleksei; Petlenkov, Eduard; Belikov, Juri; Gonzalez, Emmanuel A.2014 13th International Conference on Control, Automation, Robotics & Vision (ICARCV 2014) : Marina Bay Sands, Singapore, 10-12th December 20142014 / p. 1345-1350 : ill