Kajackas, A., and A. Anskaitis. “Investigation the Ability of Objective Measures of the Perceptual Speech Quality in Mobile Networks”. Elektronika ir Elektrotechnika 63, no. 7 (August 20, 2005): 10-15. Accessed October 6, 2022. https://eejournal.ktu.lt/index.php/elt/article/view/10489.