@article{VMUMM_1989_6_a15,
     author = {V. \'E. Shpil'rain},
     title = {Subgroups induced by ideals of the free group ring},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {60--63},
     publisher = {mathdoc},
     number = {6},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1989_6_a15/}
}