Author: Wiegold, James
- : Periodic Series. (English). Matematický časopis, vol. 18 (1968), issue 2, pp. 81-82
- : Semigroup Coverings of Groups. II. (English). Matematicko-fyzikálny časopis, vol. 12 (1962), issue 3, pp. 217-223
- : Semigroup Coverings of Groups. (English). Matematicko-fyzikálny časopis, vol. 11 (1961), issue 1, pp. 3-13
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