Geodesic
A characterization of a finite simple Hall–Janko group
Matematičeskie zametki, Tome 14 (1973) no. 4, pp. 535-542 
A. P. Il'inykh. A characterization of a finite simple Hall–Janko group. Matematičeskie zametki, Tome 14 (1973) no. 4, pp. 535-542. http://geodesic.mathdoc.fr/item/MZM_1973_14_4_a10/
@article{MZM_1973_14_4_a10,
     author = {A. P. Il'inykh},
     title = {A~characterization of a~finite simple {Hall{\textendash}Janko} group},
     journal = {Matemati\v{c}eskie zametki},
     pages = {535--542},
     year = {1973},
     volume = {14},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1973_14_4_a10/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

A finite simple Hall–Janko group in the class of simple groups is characterized by the structure of the centralizer of a central involution.