Lavappa, P.
and Kneifel, J.
(2021),
Energy Price Indices and Discount Factors for Life-Cycle Cost Analysis – 2021 Annual Supplement to NIST Handbook 135, NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NIST.IR.85-3273-36, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=932226
(Accessed March 14, 2025)