Supersymmetric R^4 actions and quantum corrections to superspace torsion   constraints
  We present the supersymmetrisation of the anomaly-related R^4 term in eleven dimensions and show that it induces no non-trivial modifications to the on-shell supertranslation algebra and the superspace torsion constraints before inclusion of gauge-field terms. 
Kasper Peeters, Pierre Vanhove and Anders Westerberg