Conference paper (2004) - D Datcu (author), M Richert (author), T Roberti (author), W Vries (author), W de Vries (author), W. de de Vries (author), W. de Vries (author), L.J.M. Rothkrantz (author), LJM Rothkrantz (author), Leon Rothkrantz (author), Leon J.M. Rothkrantz (author), L. Rothkrantz (author)