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White, J. D.; Hsu, J. H.; Yang, Shu-Chun; Fann, W. S.; Pern, G. Y.; Chen, S. A. . (2001). Observation of multiple step de-excitation in luminescent single conjugated polymers. The Journal of Chemical Physics, 114(8), 3848–. doi:10.1063/1.1343874 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research