Journal article (2011) - W Sluis-Thiescheffer (author), MM Bekker (author), JH Eggen (author), APOS Vermeeren (author), Arnold P.O.S. Vermeeren (author), A.P.O.S. Vermeeren (author), Arnold Vermeeren (author), Huib De Ridder (author), Huib de Ridder (author), Huib De de Ridder (author), H. De Ridder (author), H de Ridder (author), H. de Ridder (author), H De Ridder (author), Huib De Ridder (author), Huib Ridder (author), Huib De De Ridder (author), H. Ridder (author), H Ridder (author)