Mackey, E.
, Becker, D.
, Oflaz, R.
, Paul, R.
, Greenberg, R.
, Lindstrom, R.
, Yu, L.
, Wood, L.
, Long, S.
, Kelley, W.
and Mann, J.
(2004),
Certification of NIST Standard Reference Material 1575a pine needles and results of an international laboratory comparison:, , National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NIST.SP.260-156
(Accessed January 15, 2025)