B.  Buttenfield and Reitsma, R., ?Loglinear and Multidimensional Scaling Models of Digital Library Navigation?, International Journal of Human-Computer Studies, vol. 57, pp. 101-119, 2002.

M.  Lightner, Carlson, D., Sullivan, J., Brandemuehl, M., and Reitsma, R., ?A Living Laboratory?, Proceedings of the IEEE, vol. 88, pp. 31-40, 2000.