NIST Energy Levels and Wavelengths Bibliographic Reference # 13741
Theoretical Prediction of the Second to Fourth Actinide Ionization Potentials,
X. Y. Cao and M. Dolg,
Mol. Phys. 101, 961–969 (2003)
DOI:

Comment: Uncertainty has been estimated by A. Kramida (unpublished, 2011) based on comparisons along the isoelectronic sequence.
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