no. 2
Primitive idempotents and the socle in group rings of periodic abelian groups
Compositio Mathematica, Tome 32 (1976) no. 2, pp. 203-223 
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     author = {Richardson, J. S.},
     title = {Primitive idempotents and the socle in group rings of periodic abelian groups},
     journal = {Compositio Mathematica},
     pages = {203--223},
     year = {1976},
     publisher = {Noordhoff International Publishing},
     volume = {32},
     number = {2},
     mrnumber = {409618},
     zbl = {0328.16011},
     language = {en},
     url = {https://www.numdam.org/item/CM_1976__32_2_203_0/}
}
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Richardson, J. S. Primitive idempotents and the socle in group rings of periodic abelian groups. Compositio Mathematica, Tome 32 (1976) no. 2, pp. 203-223. https://www.numdam.org/item/CM_1976__32_2_203_0/

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