@article{matrixapproachtoroughsetsthroughvector,
  title = {Matrix approach to rough sets through vector matroids over a field},
  author = {Aiping Huang and William Zhu},
  year = {2012},
  eprint = {1211.0611},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1211.0611v3},
}