@misc{indiciaed576156637a2,
  title = {Gudermannian Complex Angles.},
  author = {A E Kennelly},
  year = {1928},
  doi = {10.1073/pnas.14.11.839},
  url = {https://pubmed.ncbi.nlm.nih.gov/16577142/},
  note = {Source identifier: 16577142}
}