Double K-shell photoionization of low-Z atoms and He-like ions J. Hoszowska, A. S. Kheifets, M. Berset, I. Bray, W. Cao, J.-Cl. Dousse, K. Fennane, M. Kavčič, Y. Kayser, J. Szlachetko and M. Szlachetko Eur. Phys. J. Special Topics, 169 (2009) 23-27 Published online: 17 March 2009 DOI: 10.1140/epjst/e2009-00968-9