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Journal article (1999) - RJ Gouka (author) , C Gerk (author) , PJJ Hooykaas (author) , P Bundock (author) , W Musters (author) , CT Verrips (author) , MJ de Groot (author)

Journal article (1998) - EG ter Schure (author) , MT Flikweert (author) , JP van Dijken (author) , CT Verrips (author)