Darafsheh, M. R., and Monfared M. Davoudi. 2010. “Characterization of $A_{16}$ by a Noncommuting Graph”. Ukrains’kyi Matematychnyi Zhurnal 62 (11): 1443–1450. https://umj.imath.kiev.ua/index.php/umj/article/view/2969.