GIAMBARTOLOMEI, Giordano; DE KEIJZER, Bart. On the Approximation Ratio of Optimal Fixed-Price Mechanisms for Single and Multi-Unit Bilateral Trade. Proceedings of the AAAI Conference on Artificial Intelligence, [S. l.], v. 40, n. 20, p. 16946–16953, 2026. DOI: 10.1609/aaai.v40i20.38741. Disponível em: https://ojs.aaai.org/index.php/AAAI/article/view/38741. Acesso em: 14 may. 2026.