@article{asurveyonneuralsymbolicsystems,
  title = {A Survey on Neural-symbolic Learning Systems},
  author = {Dongran Yu and Bo Yang and Dayou Liu and Hui Wang and Shirui Pan},
  year = {2021},
  eprint = {2111.08164},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2111.08164v3},
}