@article{numericalcodingofnominaldata,
  title = {Numerical Coding of Nominal Data},
  author = {Zenon Gniazdowski and Michal Grabowski},
  year = {2016},
  eprint = {1601.01966},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1601.01966v1},
}