Soft modes and phonon interactions in Sn2P2S6 studied by neutron scatteringS. W.H. Eijt, R. Currat, J. E. Lorenzo, P. Saint-Grégoire, B. Hennion and Yu. M. VysochanskiiEur. Phys. J. B, 5 2 (1998) 169-178DOI: https://doi.org/10.1007/s100510050431