Geodesic
Spectra of automorphic extensions of finite simple symplectic and~orthogonal groups over fields of characteristic~2
Sibirskie èlektronnye matematičeskie izvestiâ, Tome 11 (2014), pp. 823-832

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We prove that the spectrum of any nontrivial automorphic extension of a finite simple symplectic or orthogonal group $S$ over a field of characteristic $2$ differs from the spectrum of $S$.
Keywords: Finite simple group, automorphic extension, element order, spectrum of a group. 
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     author = {M. A. Zvezdina},
     title = {Spectra of automorphic extensions of finite simple symplectic and~orthogonal groups over fields of characteristic~2},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {823--832},
     publisher = {mathdoc},
     volume = {11},
     year = {2014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2014_11_a25/}
}
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M. A. Zvezdina. Spectra of automorphic extensions of finite simple symplectic and~orthogonal groups over fields of characteristic~2. Sibirskie èlektronnye matematičeskie izvestiâ, Tome 11 (2014), pp. 823-832. http://geodesic.mathdoc.fr/item/SEMR_2014_11_a25/