@misc{indiciae9514e9e7e595,
  title = {Nonlinear sigma model at theta = pi : Euclidean lattice formulation and solid-on-solid models.},
  author = {I Affleck},
  year = {1991},
  doi = {10.1103/physrevlett.66.2429},
  url = {https://pubmed.ncbi.nlm.nih.gov/10043486/},
  note = {Source identifier: 10043486}
}