A double focusing SAXS camera with µm focal spot based on a circular bragg-fresnel lens A. SNIGIREV, I. SNIGIREVA, C. RIEKEL, A. MILLER, L. WESS et T. WESS J. Phys. IV France, 03 C8 (1993) C8-443-C8-446 DOI: 10.1051/jp4:1993891