@misc{indiciae14bd8cd5f395,
  title = {Regularities Exhibited between Certain Multiplets for Elements in the Second Long Period.},
  author = {R C Gibbs and H E White},
  year = {1928},
  doi = {10.1073/pnas.14.7.559},
  url = {https://pubmed.ncbi.nlm.nih.gov/16587363/},
  note = {Source identifier: 16587363}
}