@ARTICLE{armellin2006sixth,
  title={A sixth-order accurate scheme for solving two-point boundary value problems in astrodynamics},
  author={Armellin, R. and Topputo, F.},
  journal={Celestial Mechanics and Dynamical Astronomy},
  volume={96},
  number={3-4},
  pages={289--309},
  year={2006}
}