@misc{indiciae0512dc33a161,
  title = {Phenomenological sigma models.},
  author = {NN Achasov and GN Shestakov},
  year = {1994},
  doi = {10.1103/physrevd.49.5779},
  url = {https://pubmed.ncbi.nlm.nih.gov/10016903/},
  note = {Source identifier: 10016903}
}