@misc{indiciae96e2cfd3e889,
  title = {Iteration and recursion.},
  author = {S Eilenberg and C C Elgot},
  year = {1968},
  doi = {10.1073/pnas.61.2.378},
  url = {https://pubmed.ncbi.nlm.nih.gov/16591693/},
  note = {Source identifier: 16591693}
}