@inproceedings{Sanz-Cillero:2009zk,
  author = "Sanz-Cillero, Juan Jose  and  Guo, Zhi-Hui",
  title = "{Pi-pi scattering lengths at O(p^6) revisited}",
  doi = "10.22323/1.069.0042",
  booktitle = "Proceedings of International Workshop on Effective Field Theories: from the pion to the upsilon {\textemdash} PoS(EFT09)",
  year = 2009,
  volume = "069",
  pages = "042"
}