Giambartolomei, Giordano, and Bart de Keijzer. “On the Approximation Ratio of Optimal Fixed-Price Mechanisms for Single and Multi-Unit Bilateral Trade”. Proceedings of the AAAI Conference on Artificial Intelligence 40, no. 20 (March 14, 2026): 16946–16953. Accessed May 14, 2026. https://ojs.aaai.org/index.php/AAAI/article/view/38741.