1. S. Minami:Lett. Nuovo Cimento,4, 995 (1972).
2. H. Harari:Ann. of Phys.,63, 432 (1971);Phys. Rev. Lett.,26, 1400 (1971).
3. V. Barger, K. Geer andF. Halzen:The structure of elastic scattering: are tensor exchanges peripheral?, University of Wisconsin, preprint.
4. C. Ferro Fontan, L. Masperi andR. Page:Lett. Nuovo Cimento,5, 9 (1972).
5. Phase-shift solutions: Berkeley Path 1, Berkeley Path 2, Saclay pion-nucleon phase shifts, CERN Kirsopp, CERN experimental solution and CERN theoretical fit listed in πN partial-wave amplitudes, a compilation, by Particle Data Group UCRL-20030 πN (February 1970), p. 72–80.