@misc{indiciae1c6d78321505,
  title = {Sunrise--sunset.},
  author = {D L Leever},
  year = {1997},
  doi = {10.1016/s0889-5406(97)80028-5},
  url = {https://pubmed.ncbi.nlm.nih.gov/9109590/},
  note = {Source identifier: 9109590}
}