Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Y. Takeichi,Mass Number Dependence of the Real Part of the Forward Pion-Nucleus Elastic Scattering Amplitude,Progress of Theoretical Physics,0033-068X,Oxford University Press (OUP),1976-03-01,55,3,964-966,https://cir.nii.ac.jp/crid/1360284921851180160,https://doi.org/10.1143/ptp.55.964