@misc{indiciae453a17c9761d,
  title = {Applied physics. The maser at 50.},
  author = {Ronald L Walsworth},
  year = {2004},
  doi = {10.1126/science.1101354},
  url = {https://pubmed.ncbi.nlm.nih.gov/15472067/},
  note = {Source identifier: 15472067}
}