Afonin, I. L. “Synthesis of Inductive-Capacitive Coupler Elements With Quasi-Independent from Frequency Phase Shift of Signals”. Elektronika ir Elektrotechnika 30, no. 1 (January 17, 2001). Accessed September 27, 2022. https://eejournal.ktu.lt/index.php/elt/article/view/18687.