HE, Yangkun. Elemental Signatures of Xianfeng Tongbao: XPS Evidence of Fiscal Crisis and Currency Devaluation in Late Qing China. Simen Owen Academic Proceedings Series, [S. l.], v. 3, p. 82–90, 2026. Disponível em: https://simonowenpub.com/index.php/SOAPS/article/view/63. Acesso em: 18 feb. 2026.