On exposed semigroup homomorphisms
In: Semigroup Forum, Vol. 1977, page 189-204
On the four terms in the middle theorem for almost split sequences
In: Archiv der Mathematik, Vol. 1994, page 501-505On the hierarchy of the Landau-Lifshitz equation
In: Physica, Vol. 13D, page 387-394On the number of almost split sequences with indecomposable middle term
In: The bulletin of the London Mathematical Society, Vol. 1994, page 422-426Operative Begriffsbildung in der Praxis des Geometrieunterrichts
Geometrie des FußballsIn: Beiträge zum Mathematikunterricht, Vol. 1979, page 56-59Ordered attributed grammars
In: Acta Informatica, Vol. 13.1980 Issue 3, page 229-256