@inproceedings{Zheng:2009+w,
  author = "Zheng, Hanqing",
  title = "{Unitarity constraints on chiral perturbative amplitudes}",
  doi = "10.22323/1.069.0048",
  booktitle = "Proceedings of International Workshop on Effective Field Theories: from the pion to the upsilon {\textemdash} PoS(EFT09)",
  year = 2009,
  volume = "069",
  pages = "048"
}