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2. Note on isomorphisms of group rings;Bautista Ramos;An. Inst. Mat. Univ. Nac. Autónoma México,1972
3. Units of finite algebras;Bautista Ramos;An. Inst. Mat. Univ. Nac. Autónoma México,1976
4. Group algebras of countable abelian p-groups;Berman;Dokl. Akad. Nauk SSSR,1967
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