@article{zhou2016flexible,
  title={Flexible Clustered Multi-Task Learning by Learning Representative Tasks},
  author={Zhou, Qiang and Zhao, Qi},
  journal = {IEEE Transactions on Pattern Analysis and Machine Intelligence (TPAMI)},
  volume={38},
  number={2},
  pages={266--278},
  month = {February},
  year={2016},
  publisher={IEEE}
}