TY  - RPRT
TI  - Certification of standard reference material SRM2687a, Portland cement clinker 
AU  - Stutzman, Paul
AU  - Heckert, Alan
PY  - 2019
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - NIST SP 260-195
DO  - 10.6028/NIST.SP.260-195
ER  -