@misc{1315811,
  author = {Barry N. Taylor},
  title = {The International System of Units (SI) 1991 edition},
  year = {1991},
  month = {1991-01-01 00:01:00},
  publisher = {Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NIST.SP.330e1991},
  language = {en},
}