Infrared reflectivity spectra of η-Na1.3V2O5 in the charge disordered and ordered phaseZ. V. Popović, D. M. Dokić, Z. Dohčević–Mitrović, M. Isobe and Y. UedaEur. Phys. J. B, 65 1 (2008) 1-4DOI: https://doi.org/10.1140/epjb/e2008-00329-0