Geodesic
Characterization of the simple groups $PSL(2,2^n)$ and $Sz(q)$ by biprimary subgroups
Matematičeskie zametki, Tome 8 (1970) no. 1, pp. 85-93

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A property of the groups $PSL(2,2^n)$ and $Sz(q)$ is derived which no other finite simple group possesses. This property restricts the structure of biprimary subgroups of the group. A description is given of all finite nonsolvable groups with this property. 
@article{MZM_1970_8_1_a9,
     author = {V. A. Belonogov},
     title = {Characterization of the simple groups $PSL(2,2^n)$ and $Sz(q)$ by biprimary subgroups},
     journal = {Matemati\v{c}eskie zametki},
     pages = {85--93},
     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_8_1_a9/}
}
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V. A. Belonogov. Characterization of the simple groups $PSL(2,2^n)$ and $Sz(q)$ by biprimary subgroups. Matematičeskie zametki, Tome 8 (1970) no. 1, pp. 85-93. http://geodesic.mathdoc.fr/item/MZM_1970_8_1_a9/