Foroudi Ghasemabadi M, Ahanjideh N. Characterizations of the simple group $D_{n}(3)$ by prime graph and spectrum. IJMSI. 2012; 7 (1) :91-106 URL: http://ijmsi.ir/article-1-306-en.html
We prove that $D_n(3)$, where $ngeq6$ is even, is uniquely determined by its prime graph. Also, if $G$ is a finite group with the same prime graph as $D_4(3)$, then $Gcong D_4(3), B_3(3), C_3(3)$ or $G/O_2(G)cong {rm Aut}({}^2B_2(8))$.