@article{thelogicaldifferenceforthelightweight,
  title = {The Logical Difference for the Lightweight Description Logic EL},
  author = {Boris Konev and Michel Ludwig and Dirk Walther and Frank Wolter},
  year = {2014},
  eprint = {1401.5850},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1401.5850v1},
}