@article{RocaZamora:2009GD,
  author = "Roca Zamora, Luis",
  title = "{Scalar radius of the pion and $\gamma \gamma\rightarrow \pi \pi$}",
  doi = "10.22323/1.069.0031",
  journal = "PoS",
  year = 2009,
  volume = "EFT09",
  pages = "031"
}