@article{DBLP:journals/ai/QianLPD10,
  author    = {Yuhua Qian and
               Jiye Liang and
               Witold Pedrycz and
               Chuangyin Dang},
  title     = {Positive approximation: An accelerator for attribute reduction
               in rough set theory},
  journal   = {Artif. Intell.},
  volume    = {174},
  number    = {9-10},
  year      = {2010},
  pages     = {597-618},
  ee        = {http://dx.doi.org/10.1016/j.artint.2010.04.018},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}