Darafsheh, M. R., and P. Nosratpour. “Recognition of the Groups $L_5(4)$ and $U_4(4)$ by the Prime Graph”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 64, no. 2, Feb. 2012, pp. 210-7, https://umj.imath.kiev.ua/index.php/umj/article/view/2567.