Chen X. Cost-Optimal Safety-Stock Levels for U.S. SME Importers under Tariff-Rate Volatility: A Distributionally Robust Optimization Approach. Econ. Manag. Innov. [Internet]. 2025 Sep. 30 [cited 2025 Oct. 13];2(5):72-8. Available from: http://www.gbspress.com/index.php/EMI/article/view/451