@article{MZ_1972__126_171720,
     author = {Ian Stewart},
     title = {Finite {Rings} with a {Specified} {Group} of {Units.}},
     journal = {Mathematische Zeitschrift},
     pages = {51--58},
     publisher = {mathdoc},
     volume = {126},
     year = {1972},
     zbl = {0224.16011},
     url = {http://geodesic.mathdoc.fr/item/MZ_1972__126_171720/}
}