Gust, J.
, Graham, R.
and Lombardi, M.
(2004),
Stopwatch and Timer Calibrations, Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=105239
(Accessed September 8, 2024)