References
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Work supported by the U.S. Air Force Office of Scientific Research and the National Science Foundation.
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Gyuk, I.P., Tuan, S.F. Considerations on the isobar mechanism and resonance poles for pion-baryon systems. Nuovo Cim 32, 227–233 (1964). https://doi.org/10.1007/BF02732607
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DOI: https://doi.org/10.1007/BF02732607