On finite primary rings and their groups of units
Compositio Mathematica, Tome 21 (1969) no. 3, pp. 247-252. 
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     author = {Ayoub, Christine W.},
     title = {On finite primary rings and their groups of units},
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     pages = {247--252},
     publisher = {Wolters-Noordhoff Publishing},
     volume = {21},
     number = {3},
     year = {1969},
     mrnumber = {249419},
     zbl = {0186.35202},
     language = {en},
     url = {http://www.numdam.org/item/CM_1969__21_3_247_0/}
}
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Ayoub, Christine W. On finite primary rings and their groups of units. Compositio Mathematica, Tome 21 (1969) no. 3, pp. 247-252. http://www.numdam.org/item/CM_1969__21_3_247_0/

Robert W. Gilmer, Jr. [1] "Finite rings having a cyclic multiplicative group of units". American Journal of Mathematics, vol. 85 (1963), pp. 447-452. | Zbl

Oscar Zariski and Pierre Samuel [2] Commutative Algebra. D. Van Nostrand Company, 1958. | MR | Zbl