@misc{indiciae19a41c3863d0,
  title = {An optical profilometer for spatial characterization of three-dimensional surfaces},
  author = {Kelly, W. L., IV and Burcher, E. E. and Skolaut, M. W., Jr.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19770025514},
  note = {Source identifier: 19770025514}
}