1) See, for example, “Structure and Imperfections in Amorphous and Crystalline Silicon Dioxide,” Ed. by Devine, R. A. B., Duraud, J.-P. and Dooryhée, Wiley, Chichester (2000).
2) Pasquarello, A., Curr. Opin. Solid State Mat. Sci., Vol. 5, pp. 503-508 (2001).
3) Uchino, T., Curr. Opin. Solid State Mat. Sci., Vol. 5, pp. 517-523 (2001).