@misc{indiciaecbbe290f5685,
  title = {Efficient distance calculation using the spherically-extended polytope (s-tope) model},
  author = {Hamlin, Gregory J. and Kelley, Robert B. and Tornero, Josep},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19930007488},
  note = {Source identifier: 19930007488}
}