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Herasimovich, A.; Scheinert, S.; Hörselmann, I. . (2007). Influence of traps on top and bottom contact field-effect transistors based on modified poly(phenylene-vinylene). Journal of Applied Physics, 102(5), 054509–. doi:10.1063/1.2776252 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research