@article{decidingmoralityofgraphsisnpcomplete,
  title = {Deciding Morality of Graphs is NP-complete},
  author = {Tom S. Verma and Judea Pearl},
  year = {2013},
  eprint = {1303.1501},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1303.1501v1},
}