@misc{1185581,
  author = {David B Ballard},
  title = {A Procedure for calibrating the magnification of an scanning electron microscope using NBS SRM 484:},
  year = {1977},
  month = {1977-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.IR.77-1248},
  language = {en},
}