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- 20/07/1989
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- 22/03/1989
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- 23/03/1989
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- Publication date
- 19/12/1989
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- Publication date
- 18/01/1993
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- CERN
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- 01/01/1988
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- Publication date
- 01/01/1992
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- 01/01/1991
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- Publication date
- 01/01/1995
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- Publication venue
- Publication date
- 01/01/1993
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