Intense soft X-ray matter interaction: Multiple ionization of atom clusters by free-electron laser radiationT. Möller, P. Gürtler, T. Laarmann, W. Laasch, J. Schulz, A. Swiderski and H. WabnitzEurophysics News, 34 4 (2003) 139-140DOI: https://doi.org/10.1051/epn:2003404