@inproceedings{asurveyonopeninformationextraction,
  title = {A Survey on Open Information Extraction},
  author = {Christina Niklaus and Matthias Cetto and André Freitas and Siegfried Handschuh},
  year = {2018},
  booktitle = {COLING 2018 8},
  eprint = {1806.05599},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1806.05599v1},
}