On direct decompositions in modules over group rings
In the theory of infinite groups, one of the most important useful generalizations of the classical Maschke theorem is the Kovačs-Newman theorem, which establishes sufficient conditions for the existence of G-invariant complements in modules over a periodic group G finite over the center. We genralize the Kovačs-Newman theorem to the case of modules over a group ring KG, where K is a Dedekind domain.
English version (Springer): Ukrainian Mathematical Journal 49 (1997), no. 2, pp 281-288.
Citation Example: Petrenko B. V. On direct decompositions in modules over group rings // Ukr. Mat. Zh. - 1997. - 49, № 2. - pp. 255–261.