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1. CJM 1998 (vol 50 pp. 312)

Dokuchaev, Michael A.; Singer, Maria Lucia Sobral
 Units in group rings of free products of prime cyclic groups Let $G$ be a free product of cyclic groups of prime order. The structure of the unit group ${\cal U}(\Q G)$ of the rational group ring $\Q G$ is given in terms of free products and amalgamated free products of groups. As an application, all finite subgroups of ${\cal U}(\Q G)$, up to conjugacy, are described and the Zassenhaus Conjecture for finite subgroups in $\Z G$ is proved. A strong version of the Tits Alternative for ${\cal U}(\Q G)$ is obtained as a corollary of the structural result. Keywords:Free Products, Units in group rings, Zassenhaus ConjectureCategories:20C07, 16S34, 16U60, 20E06

2. CJM 1998 (vol 50 pp. 401)

Li, Yuanlin
 The hypercentre and the $n$-centre of the unit group of an integral group ring In this paper, we first show that the central height of the unit group of the integral group ring of a periodic group is at most $2$. We then give a complete characterization of the $n$-centre of that unit group. The $n$-centre of the unit group is either the centre or the second centre (for $n \geq 2$). Categories:16U60, 20C05