Zhu, Xuejun, and Dongfen Ma. “Research on Sino-British Trade Efficiency and Potential: Based on Stochastic Frontier Gravity Model”. Frontiers in Business, Economics and Management 7, no. 3 (March 3, 2023): 305–314. Accessed May 17, 2026. https://drpress.org/ojs/index.php/fbem/article/view/5597.