X-ray dichroism in biaxial gyrotropic media: Differential absorption and fluorescence excitation spectra J. Goulon, C. Goulon-Ginet, A. Rogalev, V. Gotte, C. Brouder and C. Malgrange Eur. Phys. J. B, 12 3 (1999) 373-385 Published online: 15 December 1999 DOI: 10.1007/s100510051018