@article{Höllwieser:2011nl,
  author = "Höllwieser, Roman  and  Faber, Manfried  and  Heller, Urs M.",
  title = "{Lattice Index Theorem and Fractional Topological Charge}",
  doi = "10.22323/1.105.0276",
  journal = "PoS",
  year = 2011,
  volume = "Lattice 2010",
  pages = "276"
}