Science and Art Speeches by Klaus Borchard, Wolfgang Clement, Bärbel Dieckmann and Bernhard Korte at the opening ceremony for the Arithmeum on 8. September 1999. © Arithmeum Bonner Akademische Reden Vol. 84, Bouvier Bonn 2000. ISBN 3-416-02955-0. ISSN 0334-1857. Only available in German.