@misc{indiciae029b4fadc4fc,
  title = {Laser action generated within a light pipe: A concept},
  author = {Elachi, C. and Evans, G. A. and Yeh, Y. C. M.},
  year = {1975},
  url = {https://ntrs.nasa.gov/citations/19750000127},
  note = {Source identifier: 19750000127}
}