@misc{indiciae60cdeb8e280f,
  title = {Swiss solar eclipse expedition to Mexico.},
  author = {M Waldmeier},
  year = {1970},
  doi = {10.1038/2261139a0},
  url = {https://pubmed.ncbi.nlm.nih.gov/16057709/},
  note = {Source identifier: 16057709}
}