Geodesic
The unit groups of class character rings of sporadic groups. Quadratic case
Sibirskie èlektronnye matematičeskie izvestiâ, Tome 13 (2016), pp. 38-48

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We study the unit groups of class character rings of sporadic groups. More exactly, let $K$ be a class character ring of sporadic group. Suppose that $K$ is a subring of real quadratic field. Then we descibe unit group of $K$.
Mots-clés : sporadic group
Keywords: character, group ring, unit. 
@article{SEMR_2016_13_a0,
     author = {M. I. Molodorich},
     title = {The unit groups of class character rings of sporadic groups. {Quadratic} case},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {38--48},
     publisher = {mathdoc},
     volume = {13},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2016_13_a0/}
}
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M. I. Molodorich. The unit groups of class character rings of sporadic groups. Quadratic case. Sibirskie èlektronnye matematičeskie izvestiâ, Tome 13 (2016), pp. 38-48. http://geodesic.mathdoc.fr/item/SEMR_2016_13_a0/