@article {10525,
	title = {Influence of pH on structure and photochromic behavior of nanocrystalline WO3 films},
	journal = {Applied Surface Science},
	year = {2000},
	pages = {81-84},
	doi = {10.1016/S0169-4332(99)00523-1},
	author = {Ning Xu and Mu Sun and Y.W. Cao and J.N. Yao and E.G. Wang}
}
