Energetics of 5f- and 4f-orbitals and 5f- and 4f-elements similarity N.B. Mikheev, V.I. Spytsin, R.A. Dyachkova and L.N. Auerman J. Phys. Colloques, 40 C4 (1979) C4-230-C4-232 DOI: 10.1051/jphyscol:1979473