@InProceedings{li-EtAl:2012:PAPERS1,
  author    = {Li, Jiwei  and  Li, Sujian  and  Wang, Xun  and  Tian, Ye  and  Chang, Baobao},
  title     = {Update Summarization using a Multi-level Hierarchical Dirichlet Process Model},
  booktitle = {Proceedings of COLING 2012},
  month     = {December},
  year      = {2012},
  address   = {Mumbai, India},
  publisher = {The COLING 2012 Organizing Committee},
  pages     = {1603--1618},
  url       = {http://www.aclweb.org/anthology/C12-1098}
}