Representations of semigroups and extension of invariant linear functionals. A. Clausing Semigroup forum
Generalized Dirichlet Problems and Continuous Selections of Representing Measures. A. Clausing; G. Mägerl — 1975 Mathematische Annalen
Stable Convex Sets and Extremal Operators. A. Clausing; S. Papadopoulous — 1977 Mathematische Annalen
A short survey on stable convex sets Clausing, A. — 1978 Abstracta. 6th Winter School on Abstract Analysis