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“This book is concerned with one of the main directions in the study of group rings, namely, questions around group identities satisfied by units … . This is a nicely written book, understanding of which requires familiarity with groups and rings on the level of introductory graduate courses. Its publication is timely, taking into account the progress made in the considered theme, and I believe that it is both interesting and useful for everyone with an eye to group rings.” (Michael Dokuchaev, Mathematical Reviews, Issue 2012 d)
“The author undertakes the laborious task of expounding the … structure of unit groups of group algebras and of units of group algebras symmetric to the classical involution … . The likely reader … may not only be the specialist but the scholar whose research interests have connections with either group or ring theory … . The extensive bibliography of items relating to topics discussed allows the curious reader to gain an even deeper insight to a specific question by consulting the literature.” (János Kurdics, Zentralblatt MATH, Vol. 1203, 2011)