AlekseevaO. A., and KondratievA. S. “On Recognizability of the Group $E_8(q)$ by the Set of Orders of Elements”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 54, no. 7, July 2002, pp. 998-1003, https://umj.imath.kiev.ua/index.php/umj/article/view/4137.