@article{JMLR:v26:24-0233,
  author  = {Zhijie Xie and Shenghui Song},
  title   = {Client Selection for Federated Policy Optimization with Environment Heterogeneity},
  journal = {Journal of Machine Learning Research},
  year    = {2025},
  volume  = {26},
  number  = {286},
  pages   = {1--45},
  url     = {http://jmlr.org/papers/v26/24-0233.html}
}