@inproceedings{Rovelli:2013Ah,
  author = "Rovelli, Carlo",
  title = "{Spin Foams}",
  doi = "10.22323/1.140.0003",
  booktitle = "Proceedings of 3rd Quantum Gravity and Quantum Geometry School  {\textemdash} PoS(QGQGS 2011)",
  year = 2013,
  volume = "140",
  pages = "003"
}