Far IR spectra of Ag2CdI4 at temperature range 10–420 K: complementary experimental and first-principle theoretical studyI. Karbovnyk, S. Piskunov, I. Bolesta, S. Bellucci, M. Cestelli Guidi, M. Piccinini, E. Spohr and A. I. PopovEur. Phys. J. B, 70 4 (2009) 443-447DOI: https://doi.org/10.1140/epjb/e2009-00242-0