@article{JMLR:v15:wang14b,
  author  = {Zhan Wang and Sandra Paterlini and Fuchang Gao and Yuhong Yang},
  title   = {Adaptive Minimax Regression Estimation over Sparse $\ell_q$-Hulls},
  journal = {Journal of Machine Learning Research},
  year    = {2014},
  volume  = {15},
  number  = {50},
  pages   = {1675--1711},
  url     = {http://jmlr.org/papers/v15/wang14b.html}
}