@misc{indiciaeae7c2a0b16e3,
  title = {An automated system for terrain database construction},
  author = {Johnson, L. F. and Fretz, R. K. and Logan, T. L. and Bryant, N. A.},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/19880033833},
  note = {Source identifier: 19880033833}
}