Giambartolomei G, de Keijzer B. On the Approximation Ratio of Optimal Fixed-Price Mechanisms for Single and Multi-Unit Bilateral Trade. AAAI [Internet]. 2026 Mar. 14 [cited 2026 May 14];40(20):16946-53. Available from: https://ojs.aaai.org/index.php/AAAI/article/view/38741