@misc{indiciae26086589d18c,
  title = {Tension headache: theoretical problems.},
  author = {C Philips},
  year = {1978},
  doi = {10.1016/0005-7967(78)90023-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/718589/},
  note = {Source identifier: 718589}
}