1. T. Ziegler, A. Rauk and E.J. Baerends, On the calculation of Multiplet Energies by the Hartree Fock Slater method. Theoretica Chimica Acta 43, 261 (1977)
2. C. Daul, DFT applied to excited states. International Journal of Quantum Chemistry 52, 867 (1994)
3. E.J. Baerends, V. Branchadell and M. Sodupe, Atomic reference energies for density functional calculations. Chemical Physics Letters 265, 481 (1997)




