@Article{Humphrey2000,
  author      = {Humphrey, M. A. and Phillips, D. F. and Walsworth, R. L.},
  title       = {Double-resonance frequency shift in a hydrogen maser},
  journal     = {Physical Review A},
  year        = {2000},
  volume      = {62},
  number      = {6},
  pages       = {063405},
  month       = nov,
  comment     = {11},
  doi         = {10.1103/PhysRevA.62.063405},
  keywords    = {fundamental-phys,H-maser},
  url_erratum = {https://blog.umd.edu/walsworth/files/2020/08/2001_Humphrey_PRA_Erratum.pdf},
  url_link    = {https://link.aps.org/doi/10.1103/PhysRevA.62.063405},
  url_pdf     = {https://blog.umd.edu/walsworth/files/2020/08/2000_Humphrey_PRA.pdf},
}

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