@misc{1162921,
  author = {B W Mangum},
  title = {Standard Reference Materials ::SRM 1969 /},
  year = {1983},
  month = {1983-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.SP.260-87},
  language = {en},
}