Neutron-Proton Mass Difference in Nuclear Matter and in Finite Nuclei and the Nolen-Schiffer AnomalyU.-G. Meißner, A.M. Rakhimov, A. Wirzba and U.T. YakhshievEPJ Web of Conferences, 3 (2010) 06008DOI: https://doi.org/10.1051/epjconf/20100306008