Universal deformation rings for extensions of finite subgoups of   $Gl_2(\mathbb{C})$
  In this paper we expand on previous results, studying the extent to which one can detect fusion in certain finite groups $\Gamma$, from information about the universal deformation rings of absolutely irreducible $\mathbb{F}_p\Gamma$-modules. We consider groups which are extensions of finite irreducible subgroups of $Gl_2({\mathbb{C}})$ by elementary abelian $p$-groups of rank $2$. 
David C. Meyer
math.RA math.GR math.RT