@article{Cantini:20011h,
  author = "Cantini, Luigi  and  Menotti, Pietro  and  Seminara, Domenico",
  title = "{Polyakov conjecture and 2+1 dimensional gravity coupled to particles  }",
  doi = "10.22323/1.007.0233",
  journal = "PoS",
  year = 2001,
  volume = "hep2001",
  pages = "233"
}