Spin-polarized oxygen hole states in cation-deficient x G. Papavassiliou, M. Pissas, M. Belesi, M. Fardis, M. Karayanni, J. P. Ansermet, D. Carlier, C. Dimitropoulos and J. Dolinsek Europhys. Lett., 68 3 (2004) 453-459 Published online: 13 October 2004 DOI: 10.1209/epl/i2004-10233-3