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
.