@article{JMLR:v24:22-0520,
  author  = {Haixu Ma and Donglin Zeng and Yufeng Liu},
  title   = {Learning Optimal Group-structured Individualized Treatment Rules with Many Treatments},
  journal = {Journal of Machine Learning Research},
  year    = {2023},
  volume  = {24},
  number  = {102},
  pages   = {1--48},
  url     = {http://jmlr.org/papers/v24/22-0520.html}
}