Tholen, A.
, Brickenkamp, C.
and Heffernan, A.
(1987),
Report of the 72nd National Conference on on Weights and Measures 1987:, , National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NBS.SP.734
(Accessed September 8, 2024)