Geodesic
Some Results on Semi-Perfect Group Rings
Canadian journal of mathematics, Tome 26 (1974) no. 1, pp. 121-129

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The aim of this paper is to find necessary and sufficient conditions on a group G and a ring A for the group ring AG to be semi-perfect. A complete answer is given in the commutative case, in terms of the polynomial ring A[X] (Theorem 5.8). In the general case examples are given which indicate a very strong interaction between the properties of A and those of G. Partial answers to the question are given in Theorem 3.2, Proposition 4.2 and Corollary 4.3. 
Woods, S. M. Some Results on Semi-Perfect Group Rings. Canadian journal of mathematics, Tome 26 (1974) no. 1, pp. 121-129. doi: 10.4153/CJM-1974-013-x
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