@misc{indiciaec012648f046f,
  title = {Early post-concussional headache.},
  author = {O N Tubbs and J M Potter},
  year = {1970},
  doi = {10.1016/s0140-6736(70)92704-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/4194506/},
  note = {Source identifier: 4194506}
}