The Fubini-Furlan-Rosetti sum rule and related aspects in light of covariant baryon chiral perturbation theory⋆V. Bernard, B. Kubis and U. -G. MeißnerEur. Phys. J. A, 25 3 (2005) 419-425DOI: https://doi.org/10.1140/epja/i2005-10144-9