Backward pion-nucleon scattering F. Huang, A. Sibirtsev, J. Haidenbauer, S. Krewald and U. -G. Meißner Eur. Phys. J. A, 44 1 (2010) 81-92 Published online: 21 February 2010 DOI: 10.1140/epja/i2010-10930-2