@article{10_4064__26_1_13_16,
     author = {A. A. Bovdi and A. StrojnowskI},
     title = {On the multiplicative subgroup of a group ring},
     journal = {Banach Center Publications},
     pages = {13--16},
     publisher = {mathdoc},
     volume = {26},
     number = {1},
     year = {1990},
     doi = {10.4064/-26-1-13-16},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/-26-1-13-16/}
}