Geodesic
Characterization of simple symplectic groups of degree~4 over locally finite fields in the class of periodic groups
Algebra i logika, Tome 57 (2018) no. 3, pp. 306-320.

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Let $G$ be a periodic group containing an element of order 2 such that each of its finite subgroups of even order lies in a finite subgroup isomorphic to a simple symplectic group of degree 4. It is shown that $G$ is isomorphic to a simple symplectic group $S_4(Q)$ of degree 4 over some locally finite field $Q$.
Keywords: periodic group, locally finite field, simple symplectic group. 
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D. V. Lytkina; V. D. Mazurov. Characterization of simple symplectic groups of degree~4 over locally finite fields in the class of periodic groups. Algebra i logika, Tome 57 (2018) no. 3, pp. 306-320. http://geodesic.mathdoc.fr/item/AL_2018_57_3_a3/

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