The Chemical Nature of Oxidized Sulphur in Asphaltenes from X-Ray Absorption Spectroscopy M. Kasrai, G. M. Bancroft, R. Brunner et J. ConnanJ. Phys. IV France, 7 C2 (1997) C2-809-C2-810DOI: https://doi.org/10.1051/jp4:1997241