@misc{indiciae5fce8640ea26,
  title = {Coronary artery spasm.},
  author = {M J Butler},
  year = {1977},
  doi = {10.1136/bmj.1.6074.1472-c},
  url = {https://pubmed.ncbi.nlm.nih.gov/861704/},
  note = {Source identifier: 861704}
}