@misc{indiciae203af6e1cede,
  title = {Two-Photon-Absorption Scheme for Optical Beam Tracking},
  author = {Ortiz, Gerardo G. and Farr, William H.},
  year = {2011},
  url = {https://ntrs.nasa.gov/citations/20110003007},
  note = {Source identifier: 20110003007}
}