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- Pronk, J.T. (author), Meijer, W.M. (author), Hazeu, W. (author), Van Dijken, J.P. (author), Bos, P. (author), Kuenen, J.G. (author) journal article 1991
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- Pronk, J.T. (author), Meijer, W.M. (author), Hazeu, W. (author), van Dijken, J.P. (author), Bos, P. (author), Kuenen, J.G. (author) journal article 1991