@misc{indiciae9a2c152e9245,
  title = {Primary electric propulsion technology - Toward flight programs for the mid-1970s.},
  author = {Bartz, D. R. and Kerrisk, D. J.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680050916},
  note = {Source identifier: 19680050916}
}