Chiral Perturbation Theory: Expansions in the Mass of the Strange Quark

@article{Gasser1985ChiralPT,
  title={Chiral Perturbation Theory: Expansions in the Mass of the Strange Quark},
  author={J{\"u}rg Gasser and Heinrich Leutwyler},
  journal={Nuclear Physics},
  year={1985},
  volume={250},
  pages={465-516}
}
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