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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)