Lennon, E.
and Helfer, M.
(2001),
2001 ITL Technical Accomplishments, NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NIST.IR.6815, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50970
(Accessed January 2, 2025)