@misc{1174101,
  author = {Thomas R Lettleri and Gary G Hembree},
  title = {Certification of NBS SRM 1691 ::0.3-[mu]m-diameter polystyrene spheres},
  year = {1988},
  month = {1988-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.IR.88-3730},
  language = {en},
}