@misc{indiciae21b77aeabc64,
  title = {Preliminary design for a Zero Gravity Test Facility (ZGTF). Volume 1: Technical},
  author = {Germain, A.},
  year = {1981},
  url = {https://ntrs.nasa.gov/citations/19820017400},
  note = {Source identifier: 19820017400}
}