Geodesic
Automorphisms of Sylow $p$-subgroups of Chevalley groups over $p$-primary residue rings of integers
Fundamentalʹnaâ i prikladnaâ matematika, Tome 12 (2006) no. 8, pp. 121-158.

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In this paper, we prove that any automorphism of a Sylow $p$-subgroup of the Chevalley group over the ring $\mathbb Z_{p^m}$ (where $p$ is prime and $m\geq 1$) is a product of graph, inner, diagonal, and hypercentral automorphisms. 
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S. G. Kolesnikov. Automorphisms of Sylow $p$-subgroups of Chevalley groups over $p$-primary residue rings of integers. Fundamentalʹnaâ i prikladnaâ matematika, Tome 12 (2006) no. 8, pp. 121-158. http://geodesic.mathdoc.fr/item/FPM_2006_12_8_a5/

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