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Baruah, Upama; Chowdhury, Devasish . (2016). Functionalized graphene oxide quantum dot–PVA hydrogel: a colorimetric sensor for Fe <sup>2+</sup> , Co <sup>2+</sup> and Cu <sup>2+</sup> ions. Nanotechnology, 27(14), 145501–. doi:10.1088/0957-4484/27/14/145501 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research