@misc{indiciaec828d2547649,
  title = {CLOSED EXTREMALS.},
  author = {M Morse},
  year = {1929},
  doi = {10.1073/pnas.15.11.856},
  url = {https://pubmed.ncbi.nlm.nih.gov/16577255/},
  note = {Source identifier: 16577255}
}