Electron-positron annihilation into three pions and the radiative return
  The Monte Carlo event generator PHOKHARA, which simulates hadron and muon production at electron-positron colliders through radiative return, has been extended to final states with three pions. A model for the form factor based on generalized vector dominance has been employed, which is consistent with presently available experimental observations. 
Henryk Czyz, Agnieszka Grzelinska, Johann H. Kuhn, German Rodrigo