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[5] Ian M. Thomas, A. K. Burnham, J. R. Ertel et al.. Method for reducing the effect of environmental contamination of sol-gel optical coatings [C]. SPIE, 1999, 3492: 220~229
[7] Rui M. Almeida, Carlo G. Pantano. Structural investigation of silica gel films by infrared spectroscopy [J]. J. Appl. Phys., 1990, 68(8): 4225~4232