Study by XPS and XAS (XANES) of tungsten oxides based catalysts : WO2, WO3, 1 % Pd/WO2 and 1 % Pd/WO3 C. Bigey, V. Logie, A. Bensaddik, J.L. Schmitt et G. Maire J. Phys. IV France, 08 PR5 (1998) PR5-553-PR5-560 DOI: 10.1051/jp4:1998571