Antiferromagnetic order and phase transitions in GdS as studied with X-ray resonance-exchange scattering Th. Brückel, D. Hupfeld, J. Strempfer, W. Caliebe, K. Mattenberger, A. Stunault, N. Bernhoeft and G. J. McIntyre Eur. Phys. J. B, 19 4 (2001) 475-490 Published online: 15 February 2001 DOI: 10.1007/s100510170293