Thiele00'

BibTeX

@article{DBLP:journals/isci/Thiele00,
  author    = {Helmut Thiele},
  title     = {On axiomatic characterisations of crisp approximation operators},
  journal   = {Inf. Sci.},
  volume    = {129},
  number    = {1-4},
  year      = {2000},
  pages     = {221-226},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}