@incollection{Ure71,
  author	= {Ure, Jean N.},
  editor	= {Perren, G. E. and Trim, J. L. M.},
  year		= {1971},
  title		= {Lexical density and register differentiation},
  booktitle	= {Applications of Linguistics: Selected Papers of the 2nd International Congress of Linguistics, Cambridge 1969},
  publisher	= {Cambridge University Press},
  address	= {Cambridge}
}