In: Microprocessors and their applications / Symposium on Microprocessing and Microprogramming <5, 1979, Göteborg>, Jg. 1979, S. 249-258

In: Die Grundschule, Jg. 1986, S. 34-35

In: Mathematische Zeitschrift, Jg. 1992, S. 463-466

In: Seminar Sophus Lie, Jg. 2.1992, S. 13-20

In: Canadian journal of mathematics, Jg. 1994, S. 746-757

In: Applications of analytic and geometric methods to nonlinear differential equations : [proceedings of the NATO Advanced Research Workshop on Applications of Analytic and Geometric Methods to Nonlinear Differential Equations, Exeter, U.K., July 14 - 19, 1992] (NATO ASI series : Series C, Computer and physical sciences : 413), Jg. 1993, S. 125-138

In: Journal for the study of British cultures, Jg. 1994, S. 35-47