@inproceedings{updatesummarizationusingamultilevel,
  title = {Update Summarization using a Multi-level Hierarchical Dirichlet Process Model},
  author = {Jiwei Li and Sujian Li and Xun Wang and Ye Tian and Baobao Chang},
  year = {2012},
  booktitle = {COLING 2012 12},
  url = {https://aclanthology.org/C12-1098},
}