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- [9] A CLASS OF IDEALS OF THE CENTER OF A GROUP-RING JOURNAL OF THE AUSTRALIAN MATHEMATICAL SOCIETY SERIES A-PURE MATHEMATICS AND STATISTICS, 1981, 31 (AUG): : 146 - 151
- [10] TORSION FREE RANK OF THE MULTIPLICATIVE GROUP OF A COMMUTATIVE SEMISIMPLE TWISTED GROUP-RING OF AN ABELIAN GROUP OVER A FIELD DOKLADI NA BOLGARSKATA AKADEMIYA NA NAUKITE, 1990, 43 (05): : 13 - 13