@misc{indiciae35e7c61f8d96,
  title = {Portable precision dc voltage-current transfer standard for electrometer calibration},
  author = {G. Landis and M. Godwin},
  year = {1982},
  doi = {10.1063/1.1137127},
  url = {https://pubs.usgs.gov/publication/70011292},
  note = {Source identifier: 70011292}
}