The number of finite groups whose element orders is given. Moghaddamfar, A.R.; Shi, W.J. — 2006 Beiträge zur Algebra und Geometrie
Recognition of the finite simple groups F 4 ( 2 m ) by the spectrum. Cao, H.P.; Chen, Guiyun; Grechkoseeva, M.A.; Mazurov, V.D.; Shi, W.J.; Vasil'ev, A.V. — 2004 Sibirskij Matematicheskij Zhurnal