@misc{indiciae323ae7b3d82c,
  title = {Geometrically derived difference formulae for the numerical integration of trajectory problems},
  author = {Mcleod, R. J. Y. and Sanz-Serna, J. M.},
  year = {1981},
  url = {https://ntrs.nasa.gov/citations/19820020180},
  note = {Source identifier: 19820020180}
}