CHEN, Gang, Yunjian JIANG, Zhongyong CHEN, Bingshan MA, and Luan SU. “The Robust Two-Echelon Inventory Routing Problem for Vaccine Supply System – A Heuristic Method”. Promet - Traffic&Transportation 38, no. 4 (April 28, 2026): 957–976. Accessed April 29, 2026. https://traffic2.fpz.hr/index.php/PROMTT/article/view/1285.