@article{areenergysavingstheonlyreasonforthe,
  title = {Are energy savings the only reason for the emergence of bird echelon formation?},
  author = {Mingming Shi and Julien M. Hendrickx},
  year = {2021},
  eprint = {2103.13381},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2103.13381v1},
}