@article{JMLR:v18:15-651,
  author  = {Yaohua Hu and Chong Li and Kaiwen Meng and Jing Qin and Xiaoqi Yang},
  title   = {Group Sparse Optimization via lp,q Regularization},
  journal = {Journal of Machine Learning Research},
  year    = {2017},
  volume  = {18},
  number  = {30},
  pages   = {1--52},
  url     = {http://jmlr.org/papers/v18/15-651.html}
}