@article{Konopka1971the,
  author = {Konopka and Benzer},
  title = {Clock Mutants of Drosophila melanogaster},
  journal = {Proceedings of the National Academy of Sciences},
  year = {1971},
  doi = {10.1073/pnas.68.9.2112},
  url = {https://doi.org/10.1073/pnas.68.9.2112}
}

@article{Hardin1990the,
  author = {Hardin and Hall and Rosbash},
  title = {Feedback of the Drosophila period gene product on circadian cycling of its messenger RNA levels},
  journal = {Nature},
  year = {1990},
  doi = {10.1038/343536a0},
  url = {https://doi.org/10.1038/343536a0}
}