@misc{1187876,
  author = {D G Eitzen and G F Sushinsky and D J Chwirut and C J Bechtoldt and A W Ruff},
  title = {Improved ultrasonic standard reference blocks:},
  year = {1975},
  month = {1975-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.IR.75-685},
  language = {en},
}