@misc{1196816,
  author = {R L McKenzie},
  title = {NIST standard reference materials catalog 1990-91:},
  year = {1990},
  month = {1990-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NIST.SP.260e1990},
  language = {en},
}