Rigorous pion electromagnetic form factor behavior in the space-like   region
  New precise experimental information on $\sigma_{tot}(e^+e^- \to \pi^+ \pi^-)$ is transferred into the space-like region, by taking advantage of the analyticity. As a result a rigorous pion electromagnetic form factor behavior is obtained. The latter with some existing model predictions is compared. 
M.Belicka, S. Dubnicka, A.Z. Dubnickova and A. Liptaj
hep-ph