Štrumberger, Nada, Teodor Perić, and Gordana Štefančić. “The Efficiency of the Bimodal System Transportation”. Promet - Traffic&Transportation 10, no. 1-2 (October 11, 2012): 89–92. Accessed August 26, 2025. https://traffic2.fpz.hr/index.php/PROMTT/article/view/1858.