Tian, Yanfei, Xuecheng Sun, Lijia Chen, and Liwen Huang. “Risk Assessment of Nautical Navigational Environment Based on Grey Fixed Weight Cluster”. Promet - Traffic&Transportation 29, no. 3 (June 28, 2017): 331-342. Accessed July 12, 2025. http://traffic.fpz.hr/index.php/PROMTT/article/view/2238.