Pion–nucleon scattering: from chiral perturbation theory to Roy–Steiner equationsBastian Kubis, Martin Hoferichter, Jacobo Ruiz de Elvira and Ulf-G. MeißnerEPJ Web Conf., 130 (2016) 01006DOI: https://doi.org/10.1051/epjconf/201613001006