Geodesic
On finite groups isospectral to finite simple unitary groups over fields of characteristic~2
Sibirskie èlektronnye matematičeskie izvestiâ, Tome 10 (2013), pp. 31-37

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For every group $U=PSU_n(2^k)$ with $n\geqslant 5$, we find the number of finite groups having the same element orders as $U$.
Keywords: recognition by spectrum, unitary group, field automorphism. 
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     author = {M. A. Grechkoseeva and W. J. Shi},
     title = {On finite groups isospectral to finite simple unitary groups over fields of characteristic~2},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
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     year = {2013},
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M. A. Grechkoseeva; W. J. Shi. On finite groups isospectral to finite simple unitary groups over fields of characteristic~2. Sibirskie èlektronnye matematičeskie izvestiâ, Tome 10 (2013), pp. 31-37. http://geodesic.mathdoc.fr/item/SEMR_2013_10_a2/