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- Kelder, E.M. (author), Van der Put, P.J. (author), Becht, J.G.M. (author), Schoonman, J. (author) book chapter 1991
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- Bauer, R.A. (author), Kruis, F.E. (author), Becht, J.G.M. (author), Scarlett, B. (author), Schoonman, J. (author) journal article 1989
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- Becht, J.G.M. (author), Van der Put, P.J. (author), Schoonman, J. (author) journal article 1989
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- Becht, J.G.M. (author), Bauer, B.A. (author), Van der Put, P.J. (author), Schoonman, J. (author), Scarlett, B. (author) conference paper 1989
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- Bauer, R.A. (author), Van der Put, P.J. (author), Becht, J.G.M. (author), Schoonman, J. (author) journal article 1988
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- Becht, J.G.M. (author), Van der Put, P.J. (author), Schoonman, J. (author) journal article 1988
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- Becht, J.G.M. (author), Van der Put, P.J. (author), Schoonman, J. (author) journal article 1988