@misc{indiciae1cf5c2508f5d,
  title = {Low-thrust orbit raising in continuous sunlight while thrusting in a plane perpendicular to the earth-sun line},
  author = {Ramler, J. R.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19670024223},
  note = {Source identifier: 19670024223}
}