@misc{indiciae3c788a70339f,
  title = {When did it begin?},
  author = {E L Cooper},
  year = {1977},
  doi = {10.1016/s0145-305x(77)80001-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/346403/},
  note = {Source identifier: 346403}
}