X-ray-induced disordering of the dimerization pattern and apparent low-temperature enhancement of lattice symmetry in spinel CuIr_2S_4 - Ishibashi, H; Koo, T; Hor, Y; Borissov, A; Horibe, Y; Radaelli, P; Cheong, S; Kiryukhin, V (Physical Review B, 2002)