@article{MZ_1965__87_170388,
     author = {H.K. Farahat},
     title = {The multiplicative groups of a ring.},
     journal = {Mathematische Zeitschrift},
     pages = {378--384},
     publisher = {mathdoc},
     volume = {87},
     year = {1965},
     zbl = {0138.26803},
     url = {http://geodesic.mathdoc.fr/item/MZ_1965__87_170388/}
}