On the history of the parallel problem and the non-Euclidean geometries. (Zur Geschichte des Parallelenproblems und der nichteuklidischen Geometrien.) (German)
Mathematikunterricht 56, No. 6, 3-15 (2010).
1
International Year of Astronomy. Pt. 1: Kepler\rq s life and work. (Jahr der Astronomie. T. 1: Leben und Werk Keplers.) (German)
Monoid 29, No. 99, 31-34 (2009).
2
Who was it? (Wer war\rq s?) (German)
Monoid 28, No. 96, 5-6 (2008).
3
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