@misc{indiciae48aac04250d7,
  title = {Zero gravity ammonia propellant system},
  author = {Grabbi, R. and Krieve, W. F. and Merritt, F. L.},
  year = {1970},
  url = {https://ntrs.nasa.gov/citations/19700064088},
  note = {Source identifier: 19700064088}
}