Conference paper (2008) - B Thang (author), W Sluis-Thiescheffer (author), MM Bekker (author), B Eggen (author), A.P.O.S. Vermeeren (author), APOS Vermeeren (author), Arnold P.O.S. Vermeeren (author), Arnold Vermeeren (author), Huib De Ridder (author), Huib Ridder (author), H de Ridder (author), H. de Ridder (author), Huib De Ridder (author), H. Ridder (author), H. De Ridder (author), H Ridder (author), Huib De De Ridder (author), H De Ridder (author), Huib de Ridder (author), Huib De de Ridder (author)