@article{knowledgerepresentationandupdatein,
  title = {Knowledge representation and update in hierarchies of graphs},
  author = {Russ Harmer and Eugenia Oshurko},
  year = {2020},
  eprint = {2002.01766},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2002.01766v1},
}