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Kamminga, Machteld E.; Fang, Hong-Hua; Filip, Marina R; Giustino, Feliciano; Baas, Jacob; Blake, Graeme R.; Loi, Maria Antonietta; Palstra, Thomas T.M. . (2016). Confinement effects in low-dimensional lead Iodide perovskite hybrids. Chemistry of Materials, (), acs.chemmater.6b00809–. doi:10.1021/acs.chemmater.6b00809 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research