1. Neutron Scattering Study of the Low-Frequency Vibrations in Vitreous Silica
2. Amorphous Solids — Low Temperature Properties,1981
3. Physics of amorphous materials;Elliott,1990
4. For extensive literature and recent discussions of the boson peak see e.g [5, 6, 7, 8, 9].
5. Glassy materials and disordered solids;Binder,2005