@misc{indiciaea6f092190233,
  title = {Yesterday's solutions are today's problems.},
  author = {B E Spivey},
  year = {1981},
  doi = {10.1016/0002-9394(81)90356-1},
  url = {https://pubmed.ncbi.nlm.nih.gov/7234923/},
  note = {Source identifier: 7234923}
}