Regge approach to charged pion photoproduction at invariant energies above 2 GeV A. Sibirtsev, J. Haidenbauer, S. Krewald, T. -S. H. Lee, U. -G. Meißner and A. W. Thomas Eur. Phys. J. A, 34 1 (2007) 49-68 Published online: 11 October 2007 DOI: 10.1140/epja/i2007-10482-6