@article{Allen2003legacy,
  author = {Allen and Nelson and Alling},
  title = {The legacy of biosphere 2 for the study of biospherics and closed ecological systems},
  journal = {Advances in Space Research},
  year = {2003},
  doi = {10.1016/s0273-1177(03)00103-0},
  url = {https://doi.org/10.1016/s0273-1177(03)00103-0}
}

@article{Hendrickx2006melissa,
  author = {Hendrickx and De Wever and Hermans and others},
  title = {Microbial ecology of the closed artificial ecosystem MELiSSA (Micro-Ecological Life Support System Alternative): Reinventing and compartmentalizing the Earth's food and oxygen regeneration system for long-haul space exploration missions},
  journal = {Research in Microbiology},
  year = {2006},
  doi = {10.1016/j.resmic.2005.06.014},
  url = {https://doi.org/10.1016/j.resmic.2005.06.014}
}