Shiguang Wu, Zhaochun Ren, Xin Xin, Jiyuan Yang, Mengqi Zhang, Zhumin Chen, Maarten de Rijke and Pengjie Ren. Constrained Auto-Regressive Decoding Constrains Generative Retrieval. The 48th International ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIR), 2025. (CCF A)