@article{Yang:2014l5,
  author = "Yang, Shin Nan",
  title = "{On the complex branch points in $\pi N$ scattering amplitude and the multiple poles structure of resonances}",
  doi = "10.22323/1.205.0107",
  journal = "PoS",
  year = 2014,
  volume = "Hadron 2013",
  pages = "107"
}