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- contribution to periodical 1993
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- contribution to periodical 1993
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- contribution to periodical 1992
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- contribution to periodical 1992
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- contribution to periodical 1991
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- contribution to periodical 1990
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- contribution to periodical 1990
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- contribution to periodical 1989
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- contribution to periodical 1988
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- contribution to periodical 1988
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- contribution to periodical 1987
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- contribution to periodical 1987