@misc{indiciaef1514bb14c2c,
  title = {Geometrical approach to the nonlinear sigma model.},
  author = {NM Chepilko and K Fujii and AP Kobushkin},
  year = {1991},
  doi = {10.1103/physrevd.43.2391},
  url = {https://pubmed.ncbi.nlm.nih.gov/10013621/},
  note = {Source identifier: 10013621}
}