@misc{indiciae1a5a64ebfadb,
  title = {Birds return every spring like clockwork, but where is the clock?},
  author = {Gregory F Ball and Jacques Balthazart},
  year = {2003},
  doi = {10.1210/en.2003-0781},
  url = {https://pubmed.ncbi.nlm.nih.gov/12933642/},
  note = {Source identifier: 12933642}
}