Conference paper (2007) - M extern de Graaf (author), H. van den Berg (author), S Nunez (author), J-K van Ommeren (author), F Roijers (author), J Stemerdink (author), E Tromp (author), RJ Boucherie (author), F Brouwer (author), E. Bruin (author), H Elfrink (author), I Fernández Díaz (author), S.M. Heemstra de Groot (author), R de Haan (author), J de Jongh (author)