@article{extensionofroughsetbasedonpositive,
  title = {Extension of Rough Set Based on Positive Transitive Relation},
  author = {Min Shu and Wei Zhu},
  year = {2019},
  eprint = {1906.03337},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1906.03337v2},
}