Nano-tomography based on hard X-ray microscopy with refractive lenses C.G. Schroer, J. Meyer, M. Kuhlmann, B. Benner, T.F. Günzler, B. Lengeler, C. Rau, T. Weitkamp, A. Snigirev and I. Snigireva J. Phys. IV France, 104 (2003) 271 DOI: 10.1051/jp4:200300078