@misc{indiciae91c12c3f1faf,
  title = {Current status of solar electric-propelled asteroid probe studies},
  author = {Driver, J. M. and Wrobel, J. R.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19700036413},
  note = {Source identifier: 19700036413}
}