1- H. Malek; S. Dadras; Y. Chen, "Performance analysis of fractional order extremum seeking control", ISA Transactions, Vol 16, doi: 10.1016/j.isatra.2016.02.024.
2- H. Malek; Y. Chen, "Fractional Order Extremum Seeking Control; Performance and Stability Analysis", IEEE/ASME Transactions on Mechatronics, doi: 10.1109/TMECH.2016.2517621