On Abelian Difference Sets -- Unit Groups of Group Rings -- Projective Modules Over Polynomial Rings -- Around Automorphisms of Relatively Free Groups -- Jordan Decomposition -- On the Normalizer Problem -- values at Zero and the Galois Structure of Global Units -- Central Units in Integral Group Rings -- Alternative Loop Rings and Related Topics -- L-values at Zero and the Galois Structure of Global Units -- A Survey of Groups in which Normality or Permutability is a Transitive Relation -- The Structure of Some Group Rings -- Symmetric Elements and Identities in Group Algebras -- Serial Modules and Rings -- On Subgroups Determined by Ideals of an Integral Group Ring -- A Complex Irreducible Representation of the Quaternion Group and a Non-free Projective Module over the Polynomial Ring in Two Variables over the Real Quaternions