The Goldberger-Miyazawa-Oehme sum rule revisited V. V. Abaev, P. Metsä and M. E. Sainio Eur. Phys. J. A, 32 3 (2007) 321-325 Published online: 25 May 2007 DOI: 10.1140/epja/i2007-10377-6