@misc{indiciaebd933ff70ef7,
  title = {O(3) nonlinear sigma model and the topological distinction between integer- and half-integer-spin antiferromagnets in two dimensions.},
  author = {FD Haldane},
  year = {1988},
  doi = {10.1103/physrevlett.61.1029},
  url = {https://pubmed.ncbi.nlm.nih.gov/10039496/},
  note = {Source identifier: 10039496}
}