@misc{indiciae24c26227cd5c,
  title = {Axial anomaly and pion mass difference.},
  author = {Fayyazuddin and Riazuddin},
  year = {1990},
  doi = {10.1103/physrevd.42.2347},
  url = {https://pubmed.ncbi.nlm.nih.gov/10013091/},
  note = {Source identifier: 10013091}
}