@misc{indiciae7c71340e3f3f,
  title = {Two photon annihilation operators and squeezed vacuum},
  author = {Roy, Anil K. and Mehta, C. L. and Saxena, G. M.},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19930018137},
  note = {Source identifier: 19930018137}
}