K. R. Jha and M. Rai, “Improvement in Design of Hi-Lo Impedance Microstrip Low-pass Filter”, ELEKTRON ELEKTROTECH, vol. 87, no. 7, pp. 11–14, Aug. 2008, Accessed: Jan. 22, 2026. [Online]. Available: https://eejournal.ktu.lt/index.php/elt/article/view/11200