@inproceedings{singledocumentsummarizationasatree,
  title = {Single-Document Summarization as a Tree Knapsack Problem},
  author = {Tsutomu Hirao and Yasuhisa Yoshida and Masaaki Nishino and Norihito Yasuda and Masaaki Nagata},
  year = {2013},
  booktitle = {EMNLP 2013 10},
  url = {https://aclanthology.org/D13-1158},
}