Sotner, Roman, Lukas Langhammer, Jan Jerabek, Peter A. Ushakov, and Tomas Dostal. “Fractional-Order Phase Shifters With Constant Magnitude Frequency Responses”. Elektronika ir Elektrotechnika 25, no. 5 (October 6, 2019): 25-30. Accessed August 7, 2020. http://eejournal.ktu.lt/index.php/elt/article/view/24352.