@misc{31816,
  author = {Jeffrey Bullard},
  title = {Virtual Cement and Concrete Testing Laboratory Educational Version 2.0 User Guide},
  year = {2010},
  month = {2010-09-24},
  publisher = {NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NIST.IR.7707},
  language = {en},
}