@InProceedings{christensen-EtAl:2014:P14-1,
  author    = {Christensen, Janara  and  Soderland, Stephen  and  Bansal, Gagan  and  Mausam},
  title     = {Hierarchical Summarization: Scaling Up Multi-Document Summarization},
  booktitle = {Proceedings of the 52nd Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)},
  month     = {June},
  year      = {2014},
  address   = {Baltimore, Maryland},
  publisher = {Association for Computational Linguistics},
  pages     = {902--912},
  url       = {http://www.aclweb.org/anthology/P/P14/P14-1085}
}