Wang, Guangxin, and Hanwen Zhang. “A Study on Influencing Factors of Railway Freight Volume Based on Grey Relational Analysis and Decision Support”. Computing and Interdisciplinary Science 1, no. 1 (September 29, 2025): 18–23. Accessed February 10, 2026. https://cis.cultechpub.com/index.php/cis/article/view/4.