Vertically Focusing Double Mirror Device (VF-2M) for the ESRF Beamline ID12A R. Signorato, C. Goulon-Ginet, J. Goulon, A. Rogalev, Ph. Marion et J.-J. Fermé J. Phys. IV France, 7 C2 (1997) C2-341-C2-342 DOI: 10.1051/jp4/1997012