Exploring backward pion electroproduction in the scaling regime
  We use general relations between the Transition Distribution Amplitudes (TDAs), entering the description of the p -> pi0 transition, and the proton Distribution Amplitudes (DAs) in the soft-pion limit to estimate the size of the amplitude for backward electroproduction of pi0 at large Q2. 
J.P. Lansberg, B. Pire, L. Szymanowski