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- Vermeulen, K.J (author) report 2002
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- Vermeulen, K.J (author) report 2002
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- Vermeulen, K.J (author) report 2002
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- Keuning, Lex J.A. (author), Vermeulen, Kees Jan (author) report 2001
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- Vermeulen, K.J. (author), Poot, C.P. (author) report 2001
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- Vermeulen, K.J. (author), Sterk, F. (author) report 2001
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- Vermeulen, K.J. (author), Poot, C.P. (author) report 2000
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