@article{GDZPPN00223338X, title = {Unitary subgroup of integral groups rings.}, journal = {Manuscripta mathematica}, volume = {76}, year = {1992}, pages = {213-222}, zbl = {0779.16014}, url = {http://dml.mathdoc.fr/item/GDZPPN00223338X} }
Sehgal, S.K.; Bovdi, A.A. Unitary subgroup of integral groups rings.. Manuscripta mathematica, Tome 76 (1992) pp. 213-222. http://gdmltest.u-ga.fr/item/GDZPPN00223338X/