@misc{1194581,
  author = {G F Sushinsky and D G Eitzen and D J Chwirut and C J Bechtholdt and A W Ruff},
  title = {Improved ultrasonic standard reference blocks:},
  year = {1976},
  month = {1976-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.IR.76-984},
  language = {en},
}