@inproceedings{afeatureenrichedtreekernelforrelation,
  title = {A Feature-Enriched Tree Kernel for Relation Extraction},
  author = {Le Sun and Xianpei Han},
  year = {2014},
  booktitle = {ACL 2014 6},
  url = {https://aclanthology.org/P14-2011},
}