Two-loop threshold singularities, unstable particles and complex masses

@article{Actis2008TwoloopTS,
  title={Two-loop threshold singularities, unstable particles and complex masses},
  author={Stefano Actis and Giampiero Passarino and Christian Sturm and Sandro Uccirati},
  journal={Physics Letters B},
  year={2008},
  volume={669},
  pages={62-68}
}
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