@misc{indiciae2c368e64cc1e,
  title = {Interplanetary low-thrust mission design via Chebychev optimization methods},
  author = {Hahn, D. W. and Itzen, B. F. and Johnson, F. T.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19700059116},
  note = {Source identifier: 19700059116}
}