Hahm, G.
, Nelson, M.
, Camara, J.
and Toman, B.
(2021),
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), Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NIST.SP.260-210, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=932138
(Accessed October 10, 2024)