Ge, Huimin, Haisheng Liu, Rui Wang, Shuai Zhu, and Linbei Shao. “Research on Emergency Logistics Model of Agricultural Products Based on Coupling of Petri Net and Blockchain”. Promet - Traffic&Transportation 33, no. 6 (December 13, 2021): 883-891. Accessed August 11, 2022. https://traffic.fpz.hr/index.php/PROMTT/article/view/3845.