@article{Colangelo:2008P0,
  author = "Colangelo, Gilberto",
  title = "{Theoretical progress on pi-pi scattering lengths and phases}",
  doi = "10.22323/1.046.0038",
  journal = "PoS",
  year = 2008,
  volume = "KAON",
  pages = "038"
}