@article{liu2021convex,
  title={A convex-nonconvex strategy for grouped variable selection},
  author={Liu, Xiaoqian and Molstad, Aaron J and Chi, Eric C},
  journal={Electronic Journal of Statistics},
  volume={17},
  number={2},
  pages={2912--2961},
  year={2023},
  publisher={The Institute of Mathematical Statistics and the Bernoulli Society}
}