Mikula, Miroslav, and Slavko Šarić. “Suvremeni Trendovi Razvoja Telekomunikacija”. Promet - Traffic&Transportation 6, no. 6 (October 11, 2012): 151–153. Accessed February 28, 2026. https://traffic2.fpz.hr/index.php/PROMTT/article/view/1767.