@article{small,
  title={The identification and biogeochemical interpretation of fossil magnetotactic bacteria},
  author={Kopp RE and Kirschvink JL},
  journal={Earth-Science Reviews},
  volume={86},
  pages={1-4},
  year={2008},
  doi={doi.org/10.1016/j.earscirev.2007.08.001}
}