1. Localization of phonons in vitreous silica and related glasses;Bell,1972
2. The nature and the variation in length of the Si-O and Al-O bonds in framework silicates;Brown;Amer. Mineral.,1969
3. Variable Metric Method for Minimization;Davidon,1966
4. Band limits and the vibrational spectra of tetrahedral glasses;Galeener;Phys. Rev.,1979
5. Roman Spectroscopy;Long,1977