@misc{244221, author = {Paul Stutzman and Nathanael Heckert}, title = {Certification of Standard Reference Material® SRM2687a Portland Cement Clinker}, year = {2019}, month = {2019-03-20}, publisher = {Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD}, doi = {https://doi.org/10.6028/NIST.SP.260-195}, language = {en}, }