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On the isomorphism of $\text{Aut}({\bbfZ}_n)$, $U$-group $U(n)$ and permutation group $U(n)$. (English)
J. Niger. Assoc. Math. Phys. 13, 31-34 (2008).
The author computes the automorphism groups of ${\bbfZ}/20{\bbfZ}$ and $({\bbfZ}/20{\bbfZ})^*$.
Reviewer: Olaf Teschke (Berlin)
Classification: H44 H45