@misc{indiciae5db2bb8aa37b,
  title = {Lunar base Controlled Ecological Life Support System (LCELSS): Preliminary conceptual design study},
  author = {Schwartzkopf, Steven H.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19940014011},
  note = {Source identifier: 19940014011}
}