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At the invitation of Govindjee, we reprint here the English translation of the letter, in German, that we sent, on behalf of the Senate and the Presidium as well as the members of the German Academy of Sciences Leopoldina, from Halle (Saale), to Professor Dr. Dr. h.c.mult. Achim Trebst on his 80th birthday. The original of this letter written in German will appear in Jahrbuch 2009, Deutsche Akademie...
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