The n-point MHV one-loop Amplitude in N=4 Supergravity
  We present an explicit formula for the n-point MHV one-loop amplitude in a N=4 supergravity theory. This formula is derived from the soft and collinear factorisations of the amplitude. 
David C. Dunbar, James H. Ettle and Warren B. Perkins
hep-th