Measurement of the Two Photon Reaction $\gamma \gamma \to \pi^+ \pi^- \pi^+ \pi^-$ at Large Values of $Q^2$

The collaboration
Z.Phys.C 41 (1988) 353-357, 1988.

Abstract (data abstract)
DESY-PETRA. Measurement of the two-photon reaction gamma gamma --& gt; pi+ pi- pi+ pi- at large values of Q**2.