@misc{Lau&Taweel:06a,
  author = "K.-K. Lau and F.M. Taweel",
  title = "Data Encapsulation in Component-based Software Systems",
  note = "Pre-print CSPP-39, School of Computer Science,
          The University of Manchester, September 2006.
 \url{http://www.cs.man.ac.uk/cspreprints/PrePrints/cspp39.pdf}"    }