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Groen, E.G.J. (author) master thesis 2003
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Groen, E.G.J. (author) master thesis 2003
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Groen, E.G.J. (author) master thesis 2003
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Groen, J. (author) master thesis 1998
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Groen, C.J. (author) master thesis 1987
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Hengst, S. (author), Groen, C.J. (author), Saurwalt, K.J. (author) master thesis 1987
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Groen, C.J. (author) master thesis 1986
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Groen, C.J. (author), van Lier-Lels, M.E. (author), Hengst, S. (author) master thesis 1984