@article{multiranksparsehierarchicalclustering,
  title = {Multi-rank Sparse Hierarchical Clustering},
  author = {Hongyang Zhang and Ruben H. Zamar},
  year = {2014},
  eprint = {1409.0745},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1409.0745v2},
}