@ARTICLE{TPAMI2026Zhang,
  author={Zhang, Lijun and Bai, Haomin and Zhao, Peng and Zhou, Zhi-Hua},
  journal={IEEE Transactions on Pattern Analysis and Machine Intelligence}, 
  title={Stochastic Approximation Approaches to Group Distributionally Robust Optimization and Beyond}, 
  year={2026},
  volume={48},
  number={10},
  pages={12880-12891},
}