Chiral symmetry and hyperfine splittings Felipe J. Llanes-Estrada, Stephen R. Cotanch, Adam P. Szczepaniak and Eric S. Swanson Eur Phys J C, 33 3 (2004) s521-s523 Published online: 03 December 2003 DOI: 10.1140/epjcd/s2003-03-510-9