@misc{indiciaea83bdce9e0bd,
  title = {Spatial filter for Q-switched lasers},
  author = {Wuerker, R. F. and Heflinger, L. O.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19770025534},
  note = {Source identifier: 19770025534}
}