@misc{indiciae2cbfcdccc4a2,
  title = {Spin-polarized hydrogen maser.},
  author = {HF Hess and GP Kochanski and JM Doyle and TJ Greytak and D Kleppner},
  year = {1986},
  doi = {10.1103/physreva.34.1602},
  url = {https://pubmed.ncbi.nlm.nih.gov/9897433/},
  note = {Source identifier: 9897433}
}