Geodesic
The 2-cohomology of the group $\Omega^-(4,q)$ with coefficients in the natural module
Sbornik. Mathematics, Tome 198 (2007) no. 9, pp. 1247-1260

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The 2-cohomology group is determined for the finite simple orthogonal group $\Omega^-(4,q)$, where $q$ is odd, with coefficients in the natural module. For $q\ne9$ this group is trivial, and for $q=9$ it is isomorphic to $Z_3^4$. Thus Küsefoglu's result is corrected. Bibliography: 5 titles. 
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     title = {The 2-cohomology of the group $\Omega^-(4,q)$ with coefficients in the natural module},
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V. P. Burichenko. The 2-cohomology of the group $\Omega^-(4,q)$ with coefficients in the natural module. Sbornik. Mathematics, Tome 198 (2007) no. 9, pp. 1247-1260. http://geodesic.mathdoc.fr/item/SM_2007_198_9_a1/