Paavle, T., and M. Min. “Discrete-Level Broadband Excitation Signals: Binary/Ternary Chirps”. Elektronika ir Elektrotechnika 122, no. 6 (June 7, 2012): 23-26. Accessed June 13, 2021. https://eejournal.ktu.lt/index.php/elt/article/view/1815.