[1] [1] Deb S K. Optical and photoelectric properties and colour centres in thin films of tungsten oxide. Philos. Mag, 1973, 27:801～822

[3] [3] Agrawal A, Cronin J P, Zhang R. Review of solid state electrochromic coatings produced using sol-gel techniques. Solar Eng. Mater. and Solar Cells, 1993, 31:9～21

[4] [4] Chemseddine A, Morineau R, Livage J. Electrochromism of colloidal tungsten oxide. Solid State Ionics, 1983, 9/10:357～362

[5] [5] Nabavi M, Daeuff S, Sanchez C et al.. Sol-gel synthesis of electrochromic films. Mater. Sci. & Eng., 1989, B3:203～207

[8] [8] Hashimoto S, Matsuoka H. Lifetime of electrochromism of amorphous WO3-TiO2 thin films. J. Electrochem. Soc., 1991, 138(8):2403～2408

[9] [9] Nagase K, Shimizu Y, Miura N et al.. Electrochromism of vanadium-titanium oxide thin films prepared by spin-coating method. Appl. Phys. Lett., 1992, 61(3):243～245