L. V. Ngoc, N. D. Thinh, T. Tuan, D. A. Phuong, and H. T. Dat, “Influence of Structure on Optical Properties of WO<SUB>3</SUB> Thin Films Deposited by Sputtering Method”, Comm. Phys., vol. 20, no. 1, p. 67, Aug. 2012.