Optimizing Federated Semantic Learning in Distributed AIGC-Enabled Human Digital Twins: A Multi-Criteria and Multi-Shard User Selection Framework. - Samuel Dayo Okegbile; Haoran Gao; Oluwasegun Talabi; Jun Cai 001; Dusit Niyato; Xuemin Shen (IEEE Trans. Mob. Comput., 2025)