On the supersymmetric effective action of Matrix theory
  We present a simple derivation of the supersymmetric one-loop effective action of SU(2) Matrix theory by expressing it in a compact exponential form whose invariance under supersymmetry transformations is obvious. This result clarifies the one-loop exactness of the leading v^4 interactions and the absence of non-perturbative corrections. 
Hermann Nicolai and Jan Plefka (AEI Potsdam)