@misc{indiciae4eec99f8385c,
  title = {3-Dimensional Topographic Models for the Classroom},
  author = {Keller, J. W. and Roark, J. H. and Sakimoto, S. E. H. and Stockman, S. and Frey, H. V.},
  year = {2003},
  url = {https://ntrs.nasa.gov/citations/20030111102},
  note = {Source identifier: 20030111102}
}