@article{CM_1969__21_3_247_0,
     author = {Ayoub, Christine W.},
     title = {On finite primary rings and their groups of units},
     journal = {Compositio Mathematica},
     pages = {247--252},
     publisher = {Wolters-Noordhoff Publishing},
     volume = {21},
     number = {3},
     year = {1969},
     mrnumber = {249419},
     zbl = {0186.35202},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1969__21_3_247_0/}
}