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Visser, W. (author), Van Spronsen, E.A. (author), Nanninga, N. (author), Pronk, J.T. (author), Kuenen, J.G. (author), Van Dijken, J.P. (author)
journal article 1995
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Weusthuis, R.A. (author), Visser, W. (author), Pronk, J.T. (author), Scheffers, W.A. (author), Van Dijken, J.P. (author)
journal article 1994