@article{expressivecompletenessofexistentialrule,
  title = {Expressive Completeness of Existential Rule Languages for Ontology-based Query Answering},
  author = {Heng Zhang and Yan Zhang and Jia-Huai You},
  year = {2016},
  eprint = {1604.05006},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1604.05006v2},
}