LIU, Qing, and Qiwei QIAN. “Research on the Efficiency of Major Airports in China’s Six Major Airport Cluster: Based on Common Frontier Super-Efficiency DEA and Malmquist Method”. Promet - Traffic&Transportation 36, no. 5 (October 31, 2024): 885–901. Accessed April 3, 2025. https://traffic2.fpz.hr/index.php/PROMTT/article/view/609.