@misc{indiciae54bb4f341652,
  title = {Note on "Pendulum" Orbits in Atomic Models.},
  author = {R B Lindsay},
  year = {1927},
  doi = {10.1073/pnas.13.6.413},
  url = {https://pubmed.ncbi.nlm.nih.gov/16587189/},
  note = {Source identifier: 16587189}
}