@misc{indiciaeac1162e2f881,
  title = {Continuous hierarchical slope-aspect color display for parametric surfaces},
  author = {Moellering, Harold J. and Kimerling, A. Jon},
  year = {1994},
  url = {https://ntrs.nasa.gov/citations/20080004016},
  note = {Source identifier: 20080004016}
}