Geodesic
Automorphisms of the group $Sp_n$ ($n\leqslant4$) over a semilocal rings
Sibirskij žurnal čistoj i prikladnoj matematiki, Tome 5 (2005) no. 2, pp. 3-20

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Let $R$ be a commutative semilocal ring with invertible elements $2$, $3$, $5$ decomposable in direct sum local rings. It is proved that all automorphisms of the symplectic group $Sp_n(R)$ ($n\leqslant4$) are standard. 
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     author = {V. Ya. Bloshchitsyn},
     title = {Automorphisms of the group $Sp_n$ ($n\leqslant4$) over a semilocal rings},
     journal = {Sibirskij \v{z}urnal \v{c}istoj i prikladnoj matematiki},
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V. Ya. Bloshchitsyn. Automorphisms of the group $Sp_n$ ($n\leqslant4$) over a semilocal rings. Sibirskij žurnal čistoj i prikladnoj matematiki, Tome 5 (2005) no. 2, pp. 3-20. http://geodesic.mathdoc.fr/item/VNGU_2005_5_2_a0/