@misc{1165931,
  author = {John W Stanford and George C Paffenbarger},
  title = {Studies of dental calculus::organic portion, progress report},
  year = {1961},
  month = {1961-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.RPT.7407},
  language = {en},
}