Intriguing electron correlation effects in the photoionization of metallic quantum-dot nanorings I. Bâldea, L. S. Cederbaum and J. Schirmer Eur. Phys. J. B, 69 2 (2009) 251-264 Published online: 05 May 2009 DOI: 10.1140/epjb/e2009-00150-3