@misc{1156641,
  author = {David Ramaley},
  title = {Some modifications in methods of calibration of universal ratio sets.:},
  year = {1964},
  month = {1964-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.TN.220},
  language = {en},
}