Ralchenko, Y.
, Jou, F.
, Kelleher, D.
, Kramida, A.
, Musgrove, A.
, Reader, J.
, Wiese, W.
and Olsen, K.
(2006),
NIST Atomic Spectra Database (version 3.1.0),, http://physics.nist.gov/asd3, [online], http://physics.nist.gov/asd3
(Accessed October 8, 2024)