@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/}
}