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Moon, Young-E; Jung, Gowun; Yun, Jumi; Kim, Hyung-Il . (2013). Poly(vinyl alcohol)/poly(acrylic acid)/TiO2/graphene oxide nanocomposite hydrogels for pH-sensitive photocatalytic degradation of organic pollutants. Materials Science and Engineering: B, 178(17), 1097–1103. doi:10.1016/j.mseb.2013.07.002 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research