@misc{indiciaeaacb8570a2ad,
  title = {Cluster headache.},
  author = {J R Graham},
  year = {1972},
  doi = {10.1111/j.1526-4610.1972.hed1104175.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/5007729/},
  note = {Source identifier: 5007729}
}