Spin-polarized oxygen hole states in cation-deficient xG. Papavassiliou, M. Pissas, M. Belesi, M. Fardis, M. Karayanni, J. P. Ansermet, D. Carlier, C. Dimitropoulos and J. DolinsekEurophys. Lett., 68 3 (2004) 453-459DOI: https://doi.org/10.1209/epl/i2004-10233-3