@misc{indiciaef9d6a55f557f,
  title = {Recent Improvements to the Copernicus Trajectory Design and Optimization System},
  author = {Williams, Jacob and Senent, Juan S. and Ocampo, Cesar and Lee, David E.},
  year = {2012},
  url = {https://ntrs.nasa.gov/citations/20120001856},
  note = {Source identifier: 20120001856}
}