Leininger, P., Rueff, J. P., Mariot, J. M., Yaresko, A., Proux, O., Hazemann, J. L., Vanko, G., Sasaki, T., & Ishii, H. (2006). Hard x-ray spectroscopy in NaxCoO2 and superconducting NaxCoO2 center dot yH2O: Bulk co electronic properties. Physical Review B, 74(7):.