@article{Speziale:2013Wq,
  author = "Speziale, Simone  and  Dupuis, Maite  and  Tambornino, Johannes",
  title = "{Spinor and Twistors for LQG and Spin Foams}",
  doi = "10.22323/1.140.0021",
  journal = "PoS",
  year = 2013,
  volume = "QGQGS 2011",
  pages = "021"
}