Coursey, J.
, Dragoset, R.
, Mohr, P.
, Olsen, K.
, Saloman, E.
, Wiersma, G.
and Zucker, D.
(1997),
NIST Physics Lab. World Wide Web Page, http://physics.nist.gov/, [online], http://physics.nist.gov/
(Accessed September 10, 2024)