@conference{MaKHDL2010,
  title = "Tractable Extensions of the Description Logic EL with Numerical Datatypes",
  author = "Despoina Magka and Yevgeny Kazakov and Ian Horrocks",
  year = "2010",
  booktitle = "23rd International Workshop on Description Logics (DL 2010)",
  location = "Waterloo, Canada",
  month = "May 4--7",
}