Journal article (2006) - G. Drijkoningen (author), Guy Drijkoningen (author), G.G. Drijkoningen (author), Guy Drijkoningen (author), F Rademakers (author), E. Slob (author), Evert Cornelis Slob (author), E.C. Slob (author), EC Slob (author), Evert Slob (author), Evert C. Slob (author), Jacob T. Fokkema (author), J.T. Fokkema (author)