X-ray microspectroscopy of sulfur in basaltic glass inclusions. Inference on the volcanic sulfur emissions N. Métrich, J. Susini, L. Galoisy, G. Calas, M. Bonnin-Mosbah et B. Menez J. Phys. IV France, 104 (2003) 393-397 DOI: 10.1051/jp4:20030107