The electron decay mode of the pion Ashkin, J. ; Fazzini, T. ; Fidecaro, G. ; Merrison, A. W. ; Paul, H. ; Tollestrup, A. V. Abstract Publication: Il Nuovo Cimento Pub Date: September 1959 DOI: 10.1007/BF02725130 Bibcode: 1959NCim...13.1240A