Mokhnache, S., M. E. H. Daachi, T. Bekkouche, and N. Diffellah. “A Combined Chaotic System for Speech Encryption”. Engineering, Technology & Applied Science Research 12, no. 3 (June 6, 2022): 8578–8583. Accessed August 18, 2022. https://etasr.com/index.php/ETASR/article/view/4912.