@misc{917976, author = {Grace Hahm and Michael Nelson and Johanna Camara and Blaza Toman}, title = {Certification of Standard Reference Materials® 2969 and 2970: Vitamin D Metabolites in Frozen Human Serum (Total 25-Hydroxyvitamin D Low Level) and (25-Hydroxyvitamin D2 High Level)}, year = {2021}, month = {2021-09-02 04:09:00}, publisher = {Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD}, url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=932138}, doi = {https://doi.org/10.6028/NIST.SP.260-210}, language = {en}, }