@misc{W2170839177,
  author = {Carlton M. Caves},
  title = {Quantum limits on noise in linear amplifiers},
  year = {1982},
  howpublished = {Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields},
  doi = {https://doi.org/10.1103/physrevd.26.1817}
}