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- Wakker, K.F. (author), Ambrosius, B.A.C. (author), Leenman, H. (author) report 1989
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- Piersma, H.J.D. (author), Wakker, K.F. (author), Ambrosius, B.A.C. (author) report 1983
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- Wakker, K.F. (author), Ambrosius, B.A.C. (author) report 1983
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- Wakker, K.F. (author), Ambrosius, B.A.C. (author) report 1983
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- Wakker, K.F. (author), Ambrosius, B.A.C. (author) report 1982
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- Wakker, K.F. (author), Ambrosius, B.A.C. (author) report 1982
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- Wakker, K.F. (author), Ambrosius, B.A.C. (author), van der Ploeg, T. (author) report 1982
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- Wakker, K.F. (author), Ambrosius, B.A.C. (author) report 1981
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- Wakker, K.F. (author), Ambrosius, B.A.C. (author) report 1980
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- Wakker, K.F. (author), Ambrosius, B.A.C. (author) report 1980
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- Bedelaar, F. (author), Ambrosius, B.A.C. (author), Schoyer, H.F.R. (author) report 1980
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- Wakker, K.F. (author), Ambrosius, B.A.C. (author), van Hulzen, J.J.P. (author) report 1980
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- Wakker, K.F. (author), Ambrosius, B.A.C. (author) report 1980
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- Ambrosius, B.A.C. (author) report 1977
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- Wakker, K.F. (author), Ambrosius, B.A.C. (author), Piersma, H.J.D. (author) report 1976
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- Ambrosius, B.A.C. (author), Piersma, H.J.D. (author), Wakker, K.F. (author) report 1976
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- Wakker, K.F. (author), Ambrosius, B.A.C. (author) report 1973
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- Ambrosius, B.A.C. (author) report 1972