@misc{1139691,
  author = {Jeffrey W Bullard and Paul E Stutzman},
  title = {Analysis of CCRL Portland cement proficiency samples number 151 and number 152 using the virtual cement and concrete testing laboratory:},
  year = {2005},
  month = {2005-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NIST.IR.7260},
  language = {en},
}