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- Jongeling, T.H.G. (author), Verheij, H.J. (author), Wal, M. van der (author), Leeuwestein, W. (author) report 2000
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- Heijer, F. den (author), Schijndel, S.A.H. van (author), Sloff, C.J. (author), Wal, M. van der (author), Voorthuizen, J.M. van (author), Verheij, H.J. (author) report 1997
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- Wal, M. van der (author), Verheij, H.J. (author) report 1997
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- Meijer, D.G. (author), Wal, M. van der (author), Verheij, H.J. (author) report 1993
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- Wal, M. van der (author), Driel, G. van (author), Verheij, H.J. (author) report 1991
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- Wal, M. van der (author) report 1991
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- Termes, A.P.P. (author), Wal, M. van der (author), Verheij, H.J. (author) report 1991
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- Wal, M. van der (author) report 1991
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- Wal, M. van der (author) report 1990
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- Wal, M. van der (author), Laboyrie, H. (author) report 1989
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- Wal, M. van der (author) report 1989
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- Wal, M. van der (author) report 1987
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- Wal, M. van der (author) report 1987
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- Wal, M. van der (author) report 1986
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- Wal, M. van der (author) report 1985