Lettieri, T.
and Hembree, G.
(1988),
Certification of NBS SRM 1691: 0.3�m-diameter polystyrene spheres:, , National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NBS.IR.87-3730
(Accessed November 8, 2024)