R. . Sotner, L. . Langhammer, J. Jerabek, P. A. . Ushakov, and T. . Dostal, “Fractional-Order Phase Shifters with Constant Magnitude Frequency Responses”, ELEKTRON ELEKTROTECH, vol. 25, no. 5, pp. 25–30, Oct. 2019, doi: 10.5755/j01.eie.25.5.24352.