Shell energy in the heaviest nuclei using the Green’s function oscillator expansion method S. Ćwiok, W. Dudek, P. Kaszyński and W. Nazarewicz Eur. Phys. J. A, 23 3 (2005) 387-393 Published online: 18 January 2005 DOI: 10.1140/epja/i2004-10111-0