Elementary abelian groups of rank 5 are DCI-groups

In this paper, we show that the group Zp5 is a DCI-group for any odd prime p, that is, two Cayley digraphs Cay(Zp5,S) and Cay(Zp5,T) are isomorphic if and only if S=Tφ for some automorphism φ of the group Zp5.