Quasirecognition by the set of element orders of the groups E 6 ( q ) and 2 E 6 ( q ) . Kondrat'ev, A.S. (2007) Sibirskij Matematicheskij Zhurnal
Quasirecognition of a class of finite simple groups by the set of element orders. Alekseeva, O. A., Kondrat'ev, A. S. (2003) Sibirskij Matematicheskij Zhurnal