@article{AssaadBercxHohenadler2013,
  author    = {F. F. Assaad and M. Bercx and M. Hohenadler},
  title     = {Topological Invariant and Quantum Spin Models from Magnetic pi Fluxes in Correlated Topological Insulators},
  journal   = {Physical Review X},
  volume    = {3},
  number    = {1},
  doi       = {10.1103/PhysRevX.3.011015},
  year      = {2013},
}