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Progress of Theoretical Physics Vol. 6 No. 5 (1951) pp. 643-664 On the Self-Energies of Nucleons Hiroshi Enatsu Progress of Theoretical Physics Vol. 7 No. 5 (1952) pp. 592-595 On the Model of V-Particle and Meson-Nucleon Scattering K. Sawada Progress of Theoretical Physics Vol. 9 No. 4 (1953) pp. 455-467 On the Scattering Problem in Pseudo-scalar Meson in Pseudo-vector Coupling Katuro Sawada Progress of Theoretical Physics Vol. 10 No. 6 (1953) pp. 694-695 Fourth Order Calculations of Meson-Proton Scattering in the Symmetrical Ps(Ps) Theory K. Nakabayasi, K. Hasegawa and I. Yamamura Progress of Theoretical Physics Vol. 12 No. 2 (1954) pp. 167-176 The Effects of Heavy Particles on π-meson-proton Scattering Shigeaki Hatano, Tadashi Kaneno and Mitsuo Shindo Progress of Theoretical Physics Vol. 12 No. 5 (1954) pp. 693-694 Zero-energy Mesonic Processes and Renormalization in D.T.G.'s Formalism Shin Chiba and Mikio Namiki Progress of Theoretical Physics Vol. 22 No. 5 (1959) pp. 638-642 Effect of Strange Particles on the S-Wave Pion-Nucleon Scattering Akira Komatsuzawa, Yukihisa Nogami and Reiji Sugano Progress of Theoretical Physics Vol. 28 No. 3 (1962) pp. 479-488 Zeros of Scattering Amplitude and Consistency of Dispersion Relation Seiya Aramaki
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Ashkin et al. (1950) studied this question.
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