Pavlin, Stanislav, Vedran Sorić, Dragan Bilać, Igor Dimnik, and Daniel Galić. “Safety Management System in Croatia Control Ltd.”. Promet - Traffic&Transportation 21, no. 4 (March 2, 2012): 279-284. Accessed January 21, 2021. http://traffic.fpz.hr/index.php/PROMTT/article/view/239.