Electromagnetic Mass Difference of the Nucleon and of the Pion in the Nambu-Jona-Lasinio Model Hoshizaki, N. ; Itami, T. ; Kokubo, H. Abstract Publication: Progress of Theoretical Physics Pub Date: June 1979 DOI: 10.1143/PTP.61.1865 Bibcode: 1979PThPh..61.1865H