Tilahun, Surafel Luleseged, and Hong Choon Ong. “Bus Timetabling As a Fuzzy Multiobjective Optimization Problem Using Preference-Based Genetic Algorithm”. Promet - Traffic&Transportation 24, no. 3 (May 25, 2012): 183–191. Accessed October 3, 2025. https://traffic2.fpz.hr/index.php/PROMTT/article/view/1551.