Geodesic
Automorphisms of Chevalley groups of types $B_2$ and $G_2$ over local rings
Fundamentalʹnaâ i prikladnaâ matematika, Tome 13 (2007) no. 4, pp. 3-29

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In the paper, we prove that every automorphism of any adjoint Chevalley group of type $B_2$ or $G_2$ is standard, i.e., it is a composition of an “inner” automorphism, a ring automorphism, and a central automorphism. 
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     author = {E. I. Bunina},
     title = {Automorphisms of {Chevalley} groups of types $B_2$ and $G_2$ over local rings},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {3--29},
     publisher = {mathdoc},
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     number = {4},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2007_13_4_a0/}
}
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E. I. Bunina. Automorphisms of Chevalley groups of types $B_2$ and $G_2$ over local rings. Fundamentalʹnaâ i prikladnaâ matematika, Tome 13 (2007) no. 4, pp. 3-29. http://geodesic.mathdoc.fr/item/FPM_2007_13_4_a0/