@misc{1162876,
  author = {Thomas E Gills},
  title = {Standard Reference Materials ::Methods and procedures used at the National Bureau of Standards to certify sulfur in coal SRM's for sulfur content, calorific value, ash content/},
  year = {1984},
  month = {1984-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.SP.260-94},
  language = {en},
}