Y. He, “Elemental Signatures of Xianfeng Tongbao: XPS Evidence of Fiscal Crisis and Currency Devaluation in Late Qing China”, Simen Owen Acad. Proc. Ser., vol. 3, pp. 82–90, Feb. 2026, Accessed: Feb. 18, 2026. [Online]. Available: https://simonowenpub.com/index.php/SOAPS/article/view/63