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Herben, C.G.P. (author), Vreeburg, C.G.M. (author), Leijtens, X.J.M. (author), Blok, H. (author), Groen, F.H. (author), Moerman, I. (author), Pedersen, J.W. (author), Smit, M.K. (author)
journal article 1997