Construction of Directed Strongly Regular Graphs as Generalized Cayley   Graphs
  Directed strongly regular graphs were introduced by Duval in 1998 as one of the possible generalization of classical strongly regular graphs to the directed case. Duval also provided several construction methods for directed strongly regular graphs. In this paper, an infinite family of directed strongly regular graphs is constructed, as generalized Cayley graphs of cyclic groups. 
Rongquan Feng, Liwei Zeng
math.CO