Geodesic
Automorphisms of Chevalley groups of type $G_2$ over local rings without~$1/2$
Fundamentalʹnaâ i prikladnaâ matematika, Tome 17 (2012) no. 7, pp. 49-66

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In this paper, we prove that every automorphism of a Chevalley group of type $G_2$ over a commutative local ring without $1/2$ is the composition of a ring automorphism and a conjugation by some matrix. 
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     author = {E. I. Bunina and P. A. Veryovkin},
     title = {Automorphisms of {Chevalley} groups of type $G_2$ over local rings without~$1/2$},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {49--66},
     publisher = {mathdoc},
     volume = {17},
     number = {7},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2012_17_7_a3/}
}
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E. I. Bunina; P. A. Veryovkin. Automorphisms of Chevalley groups of type $G_2$ over local rings without~$1/2$. Fundamentalʹnaâ i prikladnaâ matematika, Tome 17 (2012) no. 7, pp. 49-66. http://geodesic.mathdoc.fr/item/FPM_2012_17_7_a3/