I. Bilinskis and K. Sudars, “Specifics of Constant Envelope Digital Signals”, ELEKTRON ELEKTROTECH, vol. 84, no. 4, pp. 13–16, Apr. 2008, Accessed: Feb. 08, 2026. [Online]. Available: https://eejournal.ktu.lt/index.php/elt/article/view/11097