@inproceedings{Gasser:2009Av,
  author = "Gasser, Juerg",
  title = "{On the history of pion-pion scattering}",
  doi = "10.22323/1.069.0029",
  booktitle = "Proceedings of International Workshop on Effective Field Theories: from the pion to the upsilon {\textemdash} PoS(EFT09)",
  year = 2009,
  volume = "069",
  pages = "029"
}