Review of the book "Lie groups, convex cones, and semigroups" by J. Hilgert, K.H. Hof mann and J.D. Lawson. W.A.F. Ruppert — 1991 Semigroup forum
On group topologies and idempotents in weak almost periodic compactifications. W.A.F. Ruppert — 1990 Semigroup forum
A Geometric Approach to the Bohr Compactification of Cones. W.A.F. Ruppert — 1988 Mathematische Zeitschrift
The Foliation of Semigroups by Congruence Classes. K.H. Hofmann; W.A.F. Ruppert — 1988 Monatshefte für Mathematik
On porcupine varieties in Lie algebras. Karl Heinrich Hofmann; W.A.F. Ruppert — 1994 Mathematische Annalen
Extensions of super Lie algebras. Alekseevsky, Dmitri; Michor, Peter W.; Ruppert, W.A.F. — 2005 Journal of Lie Theory