Salarian, M. R. “Characterization of $M_{11}$ and $L_3(3)$ by Their Commuting Graphs”. Ukrains’kyi Matematychnyi Zhurnal, vol. 62, no. 11, Nov. 2010, pp. 1583–1584, https://umj.imath.kiev.ua/index.php/umj/article/view/2983.