Anomalous vibrational modes in acetanilide as studied by inelastic neutron scattering Mariette Barthes, Juegen Eckert, Susanna W. Johnson, Jacques Moret, Basil I. Swanson and Clifford J. Unkefer J. Phys. I France, 2 10 (1992) 1929-1939 DOI: 10.1051/jp1:1992256