@misc{indiciae1c1f670f0224,
  title = {Optical profilometer},
  author = {Burcher, E. E. and Kelly, W. L., IV and Katzberg, S. J.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19760000338},
  note = {Source identifier: 19760000338}
}