Conference paper (2006) - R van der Heijden (author), C Kjellander (author), E.W.J.M. van der Drift (author), H.W.M. Salemink (author), CF Carlstrom (author), J Snijders (author), H Kicken (author), RW van der Heijden (author), CWM Bastiaansen (author), DJ Broer (author), F Karouta (author), R Notzel (author)