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3 “... of the University of Bonn under the auspices of the Sonderforschungs­ bereich 72. It took place in the Physikzentrum...”

4 “.... Ingrid Wahl and to Mrs. Heidemarlen Westhiiuser who prepared the second edition. Bonn, January 1999 Karl...”

5 “... for Mathematics, University of Bonn. The six research articles gathered here focus on recent results...”

6 “... of Heidelberg. Later he had positions at Frankfurt and Bonn before he became professeur ordinaire at Université...”

7 “... by the second named author at the University of Bonn in 1990/9l. It addresses both researchers and graduate...”

8 “... of Sociology/ Empirical Research Methods, Bonn)...”