@misc{indiciae2ed831991e3f,
  title = {Quad-Tree Visual-Calculus Analysis of Satellite Coverage},
  author = {Lo, Martin W. and Hockney, George and Kwan, Bruce},
  year = {2003},
  url = {https://ntrs.nasa.gov/citations/20110023952},
  note = {Source identifier: 20110023952}
}