@misc{indiciaed20b4fbb2c16,
  title = {Laser beam collimation using a phase conjugate Twyman-Green interferometer},
  author = {Shukla, R. P. and Dokhanian, M. and George, M. C. and Venkateswarlu, Putcha},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19910048849},
  note = {Source identifier: 19910048849}
}