@inproceedings{learningmultipletaskswithasparsematrix,
  title = {Learning Multiple Tasks with a Sparse Matrix-Normal Penalty},
  author = {Yi Zhang and Jeff G. Schneider},
  year = {2010},
  booktitle = {NeurIPS 2010 12},
  url = {http://papers.nips.cc/paper/4095-learning-multiple-tasks-with-a-sparse-matrix-normal-penalty},
}