@misc{1202221,
  author = {Jeffrey W Bullard},
  title = {User's guide to the virtual cement and concrete testing laboratory, version 1.1:},
  year = {2003},
  month = {2003-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NIST.IR.6968},
  language = {en},
}