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@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/} }
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/