X-ray absorption of and : Competition between bipolaronic and charge-density wave statesM. Merz, N. Nücker, S. Schuppler, D. Arena, J. Dvorak, Y. U. Idzerda, S. N. Ustinovich, A. G. Soldatov, S. V. Shiryaev and S. N. BariloEurophys. Lett., 72 2 (2005) 275-281DOI: https://doi.org/10.1209/epl/i2005-10236-6