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Tommi Vuorinen; Kimmo Kaunisto; Nikolai V. Tkachenko; Alexander Efimov; Helge Lemmetyinen. (2006). Photoinduced interlayer electron transfer in alternating porphyrin–fullerene dyad and regioregular poly(3-hexylthiophene) Langmuir–Blodgett films. , 178(2-3), 185–191. doi:10.1016/j.jphotochem.2005.10.014 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research