@inproceedings{semeval2015task6clinicaltempeval,
  title = {SemEval-2015 Task 6: Clinical TempEval},
  author = {Steven Bethard and Leon Derczynski and Guergana Savova and James Pustejovsky and Marc Verhagen},
  year = {2015},
  booktitle = {SEMEVAL 2015 6},
  url = {https://aclanthology.org/S15-2136},
}