@misc{indiciaea66c44c58eeb,
  title = {Analysis of future missions which require low thrust solid and hybrid propulsion systems.},
  author = {Hahn, H. T. and Kindsvater, H. M.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680051453},
  note = {Source identifier: 19680051453}
}