@misc{indiciaef3b4681c41e6,
  title = {PERIODIC RECURRING SERIES.},
  author = {E T Bell},
  year = {1930},
  doi = {10.1073/pnas.16.11.750},
  url = {https://pubmed.ncbi.nlm.nih.gov/16577304/},
  note = {Source identifier: 16577304}
}