@misc{calla2018asteroid,
  title={Asteroid mining with small spacecraft and its economic feasibility},
  author={Pablo Calla and Dan Fries and Chris Welch},
  year={2018},
  eprint={1808.05099},
  archivePrefix={arXiv},
  primaryClass={astro-ph.IM},
  url={https://arxiv.org/abs/1808.05099}
}