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SZ/PUG/2/1 - 22nd Conference, Oxford, 1972
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SZ/PUG/2/2 - 32nd Conference, Warsaw, 1982
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SZ/PUG/2/3 - 38th Conference, Dagomys, USSR, 1988
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SZ/PUG/2/4 - 40th Conference, London (Egham) 1990
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