Instantons and SL(2,R) Symmetry in Type IIB Supergravity
  We discuss the relation between the dual formulations of Type IIB supergravity emphasizing the differences between Lorentz and Euclidean signature. We demonstrate how the SL(2,R) symmetry of the usual action is manifested in the solution of the equations of motion with Euclidean signature for the dual theory. 
Martin B. Einhorn