@misc{indiciaea1263759dcc1,
  title = {Using octrees for multiresolution terrain model operations},
  author = {Wright, J. R. and Sturdevaut, K. and Morrison, J.},
  year = {2001},
  url = {https://ntrs.nasa.gov/citations/20060031391},
  note = {Source identifier: 20060031391}
}