Ahmed Soltan and  Ahmed G. Radwan and  Ahmed M. Soliman,  Measurement Fractional Order Sallen-Key Filters.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2013, vol. 84(12). 1552 - 1556
    [viewed 04 December 2021]. Available from: https://publications.waset.org/pdf/9996585.