@misc{ vrieze03towards,
  author = "P. de Vrieze and P. van Bommel and J. Klok and T. van der Weide",
  title = "Towards a twodimensional framework for user models",
  text = "de Vrieze, P., van Bommel, P., Klok, J., van der Weide, T.: Towards a twodimensional
          framework for user models. In: Proceedings of the MAWIS03 workshop attached
          to the OOIS03 conference, Geneva (2003)",
  year = "2003",
  url = "citeseer.ist.psu.edu/devrieze03towards.html" }