Marković, Nikola, Myungseob (Edward) Kim, Eungcheol Kim, and Sanjin Milinković. “A Threshold Policy for Dispatching Vehicles in Demand-Responsive Transit Systems”. Promet - Traffic&Transportation 31, no. 4 (August 26, 2019): 387-395. Accessed August 4, 2020. http://traffic.fpz.hr/index.php/PROMTT/article/view/3027.