Photon-fusion reactions from the chiral Lagrangian with dynamical light vector mesons I. V. Danilkin, M. F. M. Lutz, S. Leupold and C. Terschlüsen Eur. Phys. J. C, 73 4 (2013) 2358 Published online: 12 April 2013 DOI: 10.1140/epjc/s10052-013-2358-1