@article{GDZPPN00222318X, title = {Group Rings with Units Torsion Over the Center.}, journal = {Manuscripta mathematica}, volume = {31}, year = {1980}, pages = {145-158}, zbl = {0449.20011}, url = {http://dml.mathdoc.fr/item/GDZPPN00222318X} }
Sehgal, S.K.; Cliff, G.H. Group Rings with Units Torsion Over the Center.. Manuscripta mathematica, Tome 31 (1980) pp. 145-158. http://gdmltest.u-ga.fr/item/GDZPPN00222318X/