@misc{indiciaedfe2109200e5,
  title = {Coordinate system influence on the regularized trajectory optimization problem.},
  author = {Lewallen, J. M. and Schwausch, O. A. and Tapley, B. D.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690060557},
  note = {Source identifier: 19690060557}
}