@article{groupsparseembeddingsincollectivematrix,
  title = {Group-sparse Embeddings in Collective Matrix Factorization},
  author = {Arto Klami and Guillaume Bouchard and Abhishek Tripathi},
  year = {2013},
  eprint = {1312.5921},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1312.5921v2},
}