P. Pyykko and L. Laaksonen, “Relativistically Parameterized Extended Huckel Calculations. 8. Double-Zeta Parameters for the Actinoids Th, Pa, U, Np, Pu, and Am and an Application on Uranyl,” J. Phys. Chem., 88 (1984) 4892-95. DOI: 10.1021/j150665a017
