@misc{indiciae211efa8ed166,
  title = {Muscle-contraction headache.},
  author = {M J Martin},
  doi = {10.1016/s0033-3182(72)71462-0},
  url = {https://pubmed.ncbi.nlm.nih.gov/4671942/},
  note = {Source identifier: 4671942}
}