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contribution to periodical 1998
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contribution to periodical 1997
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contribution to periodical 1996
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contribution to periodical 1995
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contribution to periodical 1994
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contribution to periodical 1994
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contribution to periodical 1993
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contribution to periodical 1992
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contribution to periodical 1991
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contribution to periodical 1991
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contribution to periodical 1986
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contribution to periodical 1983
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contribution to periodical 1982
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contribution to periodical 1981
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contribution to periodical 1979
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contribution to periodical 1979
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contribution to periodical 1976
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contribution to periodical 1975
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van Lammeren, W.P.A (author) contribution to periodical 1975
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contribution to periodical 1974