1. Some recent conferences have been devoted partially or totally to this subject. See, for instance: M. Giordano, D. Leporini, M.P. Tosi (Eds.), Non Equilibrium Phenomena in Supercooled Fluids, Glasses and Amorphous Materials, World Scientific, Singapore, 1996; M. Rubí, C. Pérez-Vicente (Eds.), Complex Behaviour of Glassy Systems, Springer Lecture Notes in Physics, Springer, Berlin, 1997; Proceedings of the Third International Discussion Meeting on Relaxations in Complex Systems, published as special issues of J. Non-Cryst. Solids. 235–237 (1998); Second Workshop on Non-Equilibrium Phenomena in Supercooled Fluids, Glasses and Amorphous Materials, Pisa, Italy, 27 September–2 October 1998, published in J. Phys.: Condens. Matter 11 (10A) (1999); International Workshop on Collective Phenomena in the Low Temperature Physics of Glasses, held at the MPIPKS Dresden, Germany, October 2–13, 2000 (unpublished)
2. Thermal Conductivity and Specific Heat of Noncrystalline Solids
3. Tunneling states in amorphous solids
4. Anomalous low-temperature thermal properties of glasses and spin glasses
5. Amorphous Solids: Low Temperature Properties,1981