The center of $Dist(GL(m|n))$ in positive characteristic
  The purpose of this paper is to investigate central elements in distribution algebras $Dist(G)$ of general linear supergroups $G=GL(m|n)$. As an application, we compute explicitly the center of $Dist(GL(1|1))$ and its image under Harish-Chandra homomorphism. 
Alexandr N. Zubkov and Frantisek Marko
math.RT