@misc{1163231,
  author = {A Y Freedman and R S Gorozhanina},
  title = {Standard Reference Materials ::Standard samples issued in the USSR/},
  year = {1971},
  month = {1971-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.SP.260-30},
  language = {en},
}